premise: Neil wanted to see a historical spot on his trip to London.
initial: He took a bus tour to an old prison.
counterfactual: He took a bus tour to see Big Ben clock.
original_ending: It was called the Tower of London. Neil learned the history of the impressive tower. He was fascinated.
edited_ending: It was on a building called The Palace of Westminster.Neil learned the history of the impressive palace.He was fascinated.<SEP>It was a biggest clock of London.Neil learned the history of the impressive clock.He was fascinated.<SEP>It was called Big Ben.Neil learned the history of the impressive clock.He was fascinated.