context: It is probably the case that Mary got the milk. It is highly likely that Sandra left the football. It is probable that Greg is a rhino. It is probably the case that if Greg is a rhino, and Mary got the milk, then Lily is a frog. Chances are slight that if either Sandra left the football, or Mary got the milk, then Winona is a cat. There is a better than even chance that if either Mary got the milk, or Sandra left the football, then Brian is a frog.
hypothesis: It is almost certain that either Winona is a cat, or Brian is a frog.
valid_hypothesis: We doubt that either Winona is a cat, or Brian is a frog.
invalid_hypothesis: It is almost certain that either Winona is a cat, or Brian is a frog.
hypothesis_assertion: Either Winona is a cat, or Brian is a frog.