It is certain that Daniel left the apple. It is certain that Mary went to the office. It is certain that Bernhard is a lion. Chances are about even that if Bernhard is a lion, and Mary went to the office, then Emily is a mouse. It is probable that if Mary went to the office, or Bernhard is a lion, then Julius is a frog. It is likely that if either Mary went to the office, or Daniel left the apple, then Greg is a rhino.
It is certain that daniel left the apple, or Mary went to the office.
It is certain that daniel left the apple, or Mary went to the office.
It is impossible that daniel left the apple, or Mary went to the office.
Daniel left the apple, or Mary went to the office.