context: It is highly unlikely that John grabbed the milk. It is likely that Lily is gray. There is almost no chance that Sandra took the apple. It is highly unlikely that if either John grabbed the milk, or Sandra took the apple, then Mary moved to the office. It is probably not the case that if Sandra took the apple, and Lily is gray, then Greg is yellow. We believe that if John grabbed the milk, and Lily is gray, then Fred went to the garden.
hypothesis: There is almost no chance that john grabbed the milk, and Fred went to the garden.
valid_hypothesis: There is almost no chance that john grabbed the milk, and Fred went to the garden.
invalid_hypothesis: Chances are about even that john grabbed the milk, and Fred went to the garden.
hypothesis_assertion: John grabbed the milk, and Fred went to the garden.