You are a helpful assistant in evaluating the quality of the outputs for a given instruction. Your goal is to select the best output for the given instruction.

Select the Output (a) or Output (b) that is better for the given instruction. The two outputs are generated by two different AI chatbots respectively.

Here are some rules of the evaluation:
(1) You should prioritize evaluating whether the output honestly/precisely/closely executes the instruction, then consider its helpfulness, accuracy, level of detail, harmlessness, etc.
(2) Outputs should NOT contain more/less than what the instruction asks for, as such outputs do NOT precisely execute the instruction.
(3) You should avoid any potential bias and your judgment should be as objective as possible. For example, the order in which the outputs were presented should NOT affect your judgment, as Output (a) and Output (b) are **equally likely** to be the better.

Do NOT provide any explanation for your choice.
Do NOT say both / neither are good.
You should answer using ONLY "Output (a)" or "Output (b)". Do NOT output any other words.

# Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

# Output (b):
Chum Mey was a Cambodian mechanic who was living in Phnom Penh in 1975 when the Khmer Rouge took over the city. He was forced to flee to the countryside with his wife and three children, and his two-year-old son died during the journey. Chum Mey was eventually taken to Tuol Sleng prison, where he was tortured for 12 days and nights in an effort to make him confess to spying for the US and Russia. He eventually confessed to anything just to make the torture stop, and he believes this led to the arrest and murder of many innocent people. Chum Mey was eventually released and reunited with his wife and fourth child, but they were all killed by the Khmer Rouge soon after. Chum Mey eventually made his way to the genocide museum at Tuol Sleng, where he now tells his story to the world every day.

# Output (a):
In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge.

# Which is better, Output (a) or Output (b)? Your response should be either "Output (a)" or "Output (b)":

Output (a)

Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge.

Chum Mey was a Cambodian mechanic who was living in Phnom Penh in 1975 when the Khmer Rouge took over the city. He was forced to flee to the countryside with his wife and three children, and his two-year-old son died during the journey. Chum Mey was eventually taken to Tuol Sleng prison, where he was tortured for 12 days and nights in an effort to make him confess to spying for the US and Russia. He eventually confessed to anything just to make the torture stop, and he believes this led to the arrest and murder of many innocent people. Chum Mey was eventually released and reunited with his wife and fourth child, but they were all killed by the Khmer Rouge soon after. Chum Mey eventually made his way to the genocide museum at Tuol Sleng, where he now tells his story to the world every day.


You are a helpful assistant in evaluating the quality of the outputs for a given instruction. Your goal is to select the best output for the given instruction.

Select the Output (a) or Output (b) that is better for the given instruction. The two outputs are generated by two different AI chatbots respectively.

Here are some rules of the evaluation:
(1) You should prioritize evaluating whether the output honestly/precisely/closely executes the instruction, then consider its helpfulness, accuracy, level of detail, harmlessness, etc.
(2) Outputs should NOT contain more/less than what the instruction asks for, as such outputs do NOT precisely execute the instruction.
(3) You should avoid any potential bias and your judgment should be as objective as possible. For example, the order in which the outputs were presented should NOT affect your judgment, as Output (a) and Output (b) are **equally likely** to be the better.

Do NOT provide any explanation for your choice.
Do NOT say both / neither are good.
You should answer using ONLY "Output (a)" or "Output (b)". Do NOT output any other words.

# Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

# Output (b):
In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge. In 2018, Chum Mey testified in the trial of Kaing Guek Eav, the head of Tuol Sleng. He now visits the former prison which is now a genocide museum to tell the world the truth about the Tuol Sleng prison.

# Output (a):
Chum Mey was a mechanic living in Phnom Penh with his family when the Khmer Rouge captured the city on April 17, 1975. He was forced to evacuate to the countryside with his family, and his two-year-old son died during the journey. Later, he was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, he was tortured to confess to spying for the US and Russia. He was whipped, had his fingers and toenails pulled out, and was subjected to electric shocks. He eventually confessed to anything to end the torture. He was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife and held his fourth child for the first time. They were then ordered to walk into a paddy field, where their captors opened fire on them. His wife and baby were killed, but Chum Mey escaped and hid in a forest.

# Which is better, Output (a) or Output (b)? Your response should be either "Output (a)" or "Output (b)":

Output (a)

Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

Chum Mey was a mechanic living in Phnom Penh with his family when the Khmer Rouge captured the city on April 17, 1975. He was forced to evacuate to the countryside with his family, and his two-year-old son died during the journey. Later, he was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, he was tortured to confess to spying for the US and Russia. He was whipped, had his fingers and toenails pulled out, and was subjected to electric shocks. He eventually confessed to anything to end the torture. He was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife and held his fourth child for the first time. They were then ordered to walk into a paddy field, where their captors opened fire on them. His wife and baby were killed, but Chum Mey escaped and hid in a forest.

In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge. In 2018, Chum Mey testified in the trial of Kaing Guek Eav, the head of Tuol Sleng. He now visits the former prison which is now a genocide museum to tell the world the truth about the Tuol Sleng prison.


You are a helpful assistant in evaluating the quality of the outputs for a given instruction. Your goal is to select the best output for the given instruction.

Select the Output (a) or Output (b) that is better for the given instruction. The two outputs are generated by two different AI chatbots respectively.

Here are some rules of the evaluation:
(1) You should prioritize evaluating whether the output honestly/precisely/closely executes the instruction, then consider its helpfulness, accuracy, level of detail, harmlessness, etc.
(2) Outputs should NOT contain more/less than what the instruction asks for, as such outputs do NOT precisely execute the instruction.
(3) You should avoid any potential bias and your judgment should be as objective as possible. For example, the order in which the outputs were presented should NOT affect your judgment, as Output (a) and Output (b) are **equally likely** to be the better.

Do NOT provide any explanation for your choice.
Do NOT say both / neither are good.
You should answer using ONLY "Output (a)" or "Output (b)". Do NOT output any other words.

# Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

# Output (b):
In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge. In 2018, Chum Mey testified in the trial of Kaing Guek Eav, the head of Tuol Sleng. He now visits the former prison which is now a genocide museum to tell the world the truth about the Tuol Sleng prison.

# Output (a):
In 1975, Chum Mey was working as a mechanic in Phnom Penh, Cambodia, and was married with three young children. On April 17, 1975, the Khmer Rouge captured Phnom Penh, and Chum Mey and his family were forced to evacuate to the countryside. During the journey, his two-year-old son fell ill and died. Later, Chum Mey was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, Chum Mey was tortured until he eventually confessed to spying for the US and Russia. He was allowed to live because of his usefulness in fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh, and Chum Mey was marched at gunpoint into the provinces, where he was reunited with his wife and met his fourth child. Two days later, his wife and baby were shot dead by soldiers, and Chum Mey escaped alone. In 2009, Chum Mey testified at the trial of Kaing Guek Eav, also known as Comrade Duch, the head of Tuol Sleng prison.

# Which is better, Output (a) or Output (b)? Your response should be either "Output (a)" or "Output (b)":

Output (a)

Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

In 1975, Chum Mey was working as a mechanic in Phnom Penh, Cambodia, and was married with three young children. On April 17, 1975, the Khmer Rouge captured Phnom Penh, and Chum Mey and his family were forced to evacuate to the countryside. During the journey, his two-year-old son fell ill and died. Later, Chum Mey was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, Chum Mey was tortured until he eventually confessed to spying for the US and Russia. He was allowed to live because of his usefulness in fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh, and Chum Mey was marched at gunpoint into the provinces, where he was reunited with his wife and met his fourth child. Two days later, his wife and baby were shot dead by soldiers, and Chum Mey escaped alone. In 2009, Chum Mey testified at the trial of Kaing Guek Eav, also known as Comrade Duch, the head of Tuol Sleng prison.

In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge. In 2018, Chum Mey testified in the trial of Kaing Guek Eav, the head of Tuol Sleng. He now visits the former prison which is now a genocide museum to tell the world the truth about the Tuol Sleng prison.


You are a helpful assistant in evaluating the quality of the outputs for a given instruction. Your goal is to select the best output for the given instruction.

Select the Output (a) or Output (b) that is better for the given instruction. The two outputs are generated by two different AI chatbots respectively.

Here are some rules of the evaluation:
(1) You should prioritize evaluating whether the output honestly/precisely/closely executes the instruction, then consider its helpfulness, accuracy, level of detail, harmlessness, etc.
(2) Outputs should NOT contain more/less than what the instruction asks for, as such outputs do NOT precisely execute the instruction.
(3) You should avoid any potential bias and your judgment should be as objective as possible. For example, the order in which the outputs were presented should NOT affect your judgment, as Output (a) and Output (b) are **equally likely** to be the better.

Do NOT provide any explanation for your choice.
Do NOT say both / neither are good.
You should answer using ONLY "Output (a)" or "Output (b)". Do NOT output any other words.

# Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

# Output (b):
In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge. In 2018, Chum Mey testified in the trial of Kaing Guek Eav, the head of Tuol Sleng. He now visits the former prison which is now a genocide museum to tell the world the truth about the Tuol Sleng prison.

# Output (a):
In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge.

# Which is better, Output (a) or Output (b)? Your response should be either "Output (a)" or "Output (b)":

Output (a)

Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge. In 2018, Chum Mey testified in the trial of Kaing Guek Eav, the head of Tuol Sleng. He now visits the former prison which is now a genocide museum to tell the world the truth about the Tuol Sleng prison.


You are a helpful assistant in evaluating the quality of the outputs for a given instruction. Your goal is to select the best output for the given instruction.

Select the Output (a) or Output (b) that is better for the given instruction. The two outputs are generated by two different AI chatbots respectively.

Here are some rules of the evaluation:
(1) You should prioritize evaluating whether the output honestly/precisely/closely executes the instruction, then consider its helpfulness, accuracy, level of detail, harmlessness, etc.
(2) Outputs should NOT contain more/less than what the instruction asks for, as such outputs do NOT precisely execute the instruction.
(3) You should avoid any potential bias and your judgment should be as objective as possible. For example, the order in which the outputs were presented should NOT affect your judgment, as Output (a) and Output (b) are **equally likely** to be the better.

Do NOT provide any explanation for your choice.
Do NOT say both / neither are good.
You should answer using ONLY "Output (a)" or "Output (b)". Do NOT output any other words.

# Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

# Output (b):
In 1975, Chum Mey was working as a mechanic in Phnom Penh, Cambodia, and was married with three young children. On April 17, 1975, the Khmer Rouge captured Phnom Penh, and Chum Mey and his family were forced to evacuate to the countryside. During the journey, his two-year-old son fell ill and died. Later, Chum Mey was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, Chum Mey was tortured until he eventually confessed to spying for the US and Russia. He was allowed to live because of his usefulness in fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh, and Chum Mey was marched at gunpoint into the provinces, where he was reunited with his wife and met his fourth child. Two days later, his wife and baby were shot dead by soldiers, and Chum Mey escaped alone. In 2009, Chum Mey testified at the trial of Kaing Guek Eav, also known as Comrade Duch, the head of Tuol Sleng prison.

# Output (a):
Chum Mey was a mechanic living in Phnom Penh with his family when the Khmer Rouge captured the city on April 17, 1975. He was forced to evacuate to the countryside with his family, and his two-year-old son died during the journey. Later, he was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, he was tortured to confess to spying for the US and Russia. He was whipped, had his fingers and toenails pulled out, and was subjected to electric shocks. He eventually confessed to anything to end the torture. He was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife and held his fourth child for the first time. They were then ordered to walk into a paddy field, where their captors opened fire on them. His wife and baby were killed, but Chum Mey escaped and hid in a forest.

# Which is better, Output (a) or Output (b)? Your response should be either "Output (a)" or "Output (b)":

Output (a)

Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

Chum Mey was a mechanic living in Phnom Penh with his family when the Khmer Rouge captured the city on April 17, 1975. He was forced to evacuate to the countryside with his family, and his two-year-old son died during the journey. Later, he was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, he was tortured to confess to spying for the US and Russia. He was whipped, had his fingers and toenails pulled out, and was subjected to electric shocks. He eventually confessed to anything to end the torture. He was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife and held his fourth child for the first time. They were then ordered to walk into a paddy field, where their captors opened fire on them. His wife and baby were killed, but Chum Mey escaped and hid in a forest.

In 1975, Chum Mey was working as a mechanic in Phnom Penh, Cambodia, and was married with three young children. On April 17, 1975, the Khmer Rouge captured Phnom Penh, and Chum Mey and his family were forced to evacuate to the countryside. During the journey, his two-year-old son fell ill and died. Later, Chum Mey was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, Chum Mey was tortured until he eventually confessed to spying for the US and Russia. He was allowed to live because of his usefulness in fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh, and Chum Mey was marched at gunpoint into the provinces, where he was reunited with his wife and met his fourth child. Two days later, his wife and baby were shot dead by soldiers, and Chum Mey escaped alone. In 2009, Chum Mey testified at the trial of Kaing Guek Eav, also known as Comrade Duch, the head of Tuol Sleng prison.


You are a helpful assistant in evaluating the quality of the outputs for a given instruction. Your goal is to select the best output for the given instruction.

Select the Output (a) or Output (b) that is better for the given instruction. The two outputs are generated by two different AI chatbots respectively.

Here are some rules of the evaluation:
(1) You should prioritize evaluating whether the output honestly/precisely/closely executes the instruction, then consider its helpfulness, accuracy, level of detail, harmlessness, etc.
(2) Outputs should NOT contain more/less than what the instruction asks for, as such outputs do NOT precisely execute the instruction.
(3) You should avoid any potential bias and your judgment should be as objective as possible. For example, the order in which the outputs were presented should NOT affect your judgment, as Output (a) and Output (b) are **equally likely** to be the better.

Do NOT provide any explanation for your choice.
Do NOT say both / neither are good.
You should answer using ONLY "Output (a)" or "Output (b)". Do NOT output any other words.

# Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

# Output (b):
In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge.

# Output (a):
Chum Mey was a mechanic living in Phnom Penh with his family when the Khmer Rouge captured the city on April 17, 1975. He was forced to evacuate to the countryside with his family, and his two-year-old son died during the journey. Later, he was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, he was tortured to confess to spying for the US and Russia. He was whipped, had his fingers and toenails pulled out, and was subjected to electric shocks. He eventually confessed to anything to end the torture. He was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife and held his fourth child for the first time. They were then ordered to walk into a paddy field, where their captors opened fire on them. His wife and baby were killed, but Chum Mey escaped and hid in a forest.

# Which is better, Output (a) or Output (b)? Your response should be either "Output (a)" or "Output (b)":

Output (a)

Instruction:
Here is an article:
For more than three decades Chum Mey has carried the physical and emotional scars inflicted on him by agents of Cambodia's Khmer Rouge. By Zoe MurphyBBC News He is one of a only handful of people to have survived Tuol Sleng prison, code-named S-21 - the regime's interrogation centre and site of torture and mass murder. Last year, from behind bullet-proof glass in a Phnom Penh courtroom, Chum Mey finally told his story to the world. He was a leading witness in the first trial of a senior Khmer Rouge figure, Kaing Guek Eav, also known as Comrade Duch. Duch was the head of Tuol Sleng, were as many as 17,000 men, women and children were detained and then killed. Chum Mey's testimony to the United Nations-backed court could perhaps help bring them a degree of long-delayed justice. Forced exodus In 1975, Chum Mey - originally from Prey Veng province - was working in Phnom Penh as a mechanic. He was married with three young children. Cambodia at that time was in political turmoil, with the leaders of a 1970 military coup locked in civil war against Pol Pot's forces. On 17 April 1975 the Khmer Rouge captured Phnom Penh. "When they entered everybody including myself raised a white flag to congratulate them; everybody cheered," Chum Mey told the war crimes tribunal. Just hours later, Khmer Rouge representatives went door-to-door telling people to evacuate to the countryside. Chum Mey said those who did not co-operate were shot dead. He gathered his wife and children and joined the exodus. His two-year-old son fell ill and died during the journey. Chum Mey was forced to bury him in a shallow grave and move on. Later, he was sent back to the capital by the Khmer Rouge to repair sewing machines for a co-operative manufacturing the new revolutionary uniform, black pyjamas. On 28 October 1978 he and other workers were told they were being sent to fix vehicles for an offensive against Vietnam. In reality, Chum Mey was about to enter the darkest period of his life, as he was taken to Tuol Sleng. Conspirator There he was imprisoned in a brick cell about two metres by one metre wide, blind-folded and shackled to the floor. For 12 days and nights, Chum Mey says he was tortured, as his interrogators tried to make him confess to spying for the US and Russia. "If you refuse to confess I'll beat you to death. You must tell the truth then I won't kill you. If not I must kill you," he quoted his tormentors as saying. He was whipped repeatedly about the body with a switch of bamboo sticks. When he held up his hands to try to shield himself his fingers were broken. His toenails were pulled out with pliers while his legs were shackled. When he still refused to confess, the nails were twisted and pulled off his other foot. Finally, Chum Mey said he was subjected to electric shocks several times with a wire from a 220-volt wall socket. On each occasion he passed out. When he came round, he was asked again to confess. Eventually he said he confessed to anything so that the torture would be over. In his confession Chum Mey wrote that he was working for the CIA and had recruited dozens of agents in Cambodia. He gave the names of dozens of acquaintances, innocent men and women who, it is presumed, were later arrested, tortured and murdered. "People who had been arrested and killed previously had implicated me, and I implicated others. So did other people. "It was just like rear waves pushing the front waves forward. So people would die one after another, after another, after another," he said in a BBC interview in 2002. Further tragedy Chum Mey believes he was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. At night he was chained to a long iron bar with 40 other prisoners. He says they were forced to live in silence. "When I wept I could not make any noise. I wept a lot and I had no more tears to weep, I was only waiting for the day that I would be killed," he later told the war crimes trial. On 7 January 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife, and held for the first time his fourth child - a boy, just two months old. For two days they travelled together to an isolated area with a group of other prisoners. They were then ordered to walk into a paddy field, where their captors opened fire on them. The soldiers shot dead his wife and baby. Chum Mey escaped alone and hid in a forest. Justice "I cry every night. Every time I hear people talk about the Khmer Rouge it reminds me of my wife and children," Chum Mey told the public gallery at Duch's trial. He has said that only the court can help to "wash away" his suffering. Last year he was elected as the head of the newly-formed Association of Victims of the Khmer Rouge Regime. Speaking to the BBC just weeks before the verdict, Chum Mey said he hoped Duch would be sentenced to life in prison. But he said he felt cheated by the court, which he said seemed to place most of the responsibility for crimes committed on those perpetrators already dead, rather than focusing on the accused. Although the trial has not brought closure for Cambodians, he told the BBC's Guy De Launey he was satisfied that a judicial system was now in place. Most days Chum Mey can be found at the former prison, which is now a genocide museum, housing the photographs and written confessions of many of the victims. "I come every day to tell the world the truth about the Tuol Sleng prison... so that none of these crimes are ever repeated anywhere in the world."

Here is an summary requirement:
Summarize the experiences of Chum Mey in the 1970s with a timeline.

Please summarize the above article based on the given requirement:

Chum Mey was a mechanic living in Phnom Penh with his family when the Khmer Rouge captured the city on April 17, 1975. He was forced to evacuate to the countryside with his family, and his two-year-old son died during the journey. Later, he was sent back to the capital to repair sewing machines for the Khmer Rouge. On October 28, 1978, he was taken to Tuol Sleng prison, where he was imprisoned, blindfolded, and shackled to the floor. For 12 days and nights, he was tortured to confess to spying for the US and Russia. He was whipped, had his fingers and toenails pulled out, and was subjected to electric shocks. He eventually confessed to anything to end the torture. He was allowed to live because he was of use to the regime, fixing sewing machines in the prison workshop. On January 7, 1979, Vietnamese troops captured Phnom Penh from the Khmer Rouge, and the prison staff fled. Chum Mey was marched at gunpoint by prison guards into the provinces, where he had a chance meeting with his wife and held his fourth child for the first time. They were then ordered to walk into a paddy field, where their captors opened fire on them. His wife and baby were killed, but Chum Mey escaped and hid in a forest.

In 1975, Chum Mey was working in Phnom Penh as a mechanic and was married with three young children. On 17 April 1975, the Khmer Rouge captured Phnom Penh and forced people to evacuate to the countryside. Chum Mey's two-year-old son fell ill and died during the journey. In October 1978, Chum Mey was sent to Tuol Sleng prison, where he was tortured and interrogated for 12 days. He was forced to confess to spying for the US and Russia and implicated innocent people who were later arrested and killed. In January 1979, Vietnamese troops captured Phnom Penh and Chum Mey escaped with his wife and fourth child. However, his wife and baby were shot dead by the Khmer Rouge.