context: There is a better than even chance that Fred went to the kitchen. There is almost no chance that Julius is a lion. There is little chance that John discarded the apple. It is improbable that if John discarded the apple, and Fred went to the kitchen, then Brian is gray. It is almost certain that if either Fred went to the kitchen, or Julius is a lion, then Mary got the milk. Chances are slight that if Julius is a lion, or John discarded the apple, then Bernhard is green.
hypothesis: There is almost no chance that fred went to the kitchen, or Brian is gray.
valid_hypothesis: There is a better than even chance that fred went to the kitchen, or Brian is gray.
invalid_hypothesis: There is almost no chance that fred went to the kitchen, or Brian is gray.
hypothesis_assertion: Fred went to the kitchen, or Brian is gray.