context: It is likely that Greg is gray. It is highly likely that Mary moved to the office. Chances are slight that Fred discarded the milk. There is almost no chance that if Greg is gray, and Mary moved to the office, then Brian is a lion. It is highly unlikely that if Greg is gray, or Fred discarded the milk, then John dropped the apple. It is highly likely that if Fred discarded the milk, and Mary moved to the office, then Lily is green.
hypothesis: It is improbable that either Lily is green, or Brian is a lion.
valid_hypothesis: It is improbable that either Lily is green, or Brian is a lion.
invalid_hypothesis: It is highly likely that either Lily is green, or Brian is a lion.
hypothesis_assertion: Either Lily is green, or Brian is a lion.