context: We doubt that Julius is a lion. It is probable that Mary took the apple. It is probably the case that Greg is a swan. It is certain that if Greg is a swan, and Julius is a lion, then Bernhard is yellow. It is impossible that if Julius is a lion, or Greg is a swan, then John got the milk. It is probably not the case that if Greg is a swan, or Julius is a lion, then Brian is gray.
hypothesis: Chances are slight that either John got the milk, or Greg is a swan.
valid_hypothesis: It is probably the case that either John got the milk, or Greg is a swan.
invalid_hypothesis: Chances are slight that either John got the milk, or Greg is a swan.
hypothesis_assertion: Either John got the milk, or Greg is a swan.