context: It is impossible that Greg is gray. It is certain that Lily is a lion. There is a very good chance that John left the football. It is impossible that if either Greg is gray, or Lily is a lion, then Brian is a frog. It is certain that if Greg is gray, or Lily is a lion, then Mary went to the garden. It is impossible that if John left the football, or Greg is gray, then Jeff discarded the apple.
hypothesis: It is impossible that jeff discarded the apple, or Greg is gray.
valid_hypothesis: It is impossible that jeff discarded the apple, or Greg is gray.
invalid_hypothesis: It is certain that jeff discarded the apple, or Greg is gray.
hypothesis_assertion: Jeff discarded the apple, or Greg is gray.