context: It is probable that Lily is a lion. Chances are slight that John grabbed the milk. It is almost certain that Brian is green. It is almost certain that if Brian is green, or John grabbed the milk, then Sandra got the football. It is highly likely that if either Lily is a lion, or John grabbed the milk, then Fred went to the bedroom. It is highly unlikely that if Brian is green, or John grabbed the milk, then Greg is yellow.
hypothesis: It is highly likely that either Brian is green, or Greg is yellow.
valid_hypothesis: It is highly likely that either Brian is green, or Greg is yellow.
invalid_hypothesis: We doubt that either Brian is green, or Greg is yellow.
hypothesis_assertion: Either Brian is green, or Greg is yellow.