context: There is little chance that Greg is gray. It is likely that Lily is a lion. We believe that Mary dropped the apple.
hypothesis: It is highly unlikely that lily is a lion, and Greg is gray.
valid_hypothesis: It is highly unlikely that lily is a lion, and Greg is gray.
invalid_hypothesis: It is certain that lily is a lion, and Greg is gray.
hypothesis_assertion: Lily is a lion, and Greg is gray.