context: It is impossible that Gertrude is a mouse. There is almost no chance that Julius is a rhino. It is almost certain that John moved to the garden. It is almost certain that if Gertrude is a mouse, and John moved to the garden, then Sandra grabbed the milk. We doubt that if either Julius is a rhino, or John moved to the garden, then Bernhard is yellow. It is probably not the case that if John moved to the garden, or Julius is a rhino, then Brian is a lion.
hypothesis: It is likely that either John moved to the garden, or Brian is a lion.
valid_hypothesis: It is likely that either John moved to the garden, or Brian is a lion.
invalid_hypothesis: Chances are slight that either John moved to the garden, or Brian is a lion.
hypothesis_assertion: Either John moved to the garden, or Brian is a lion.