context: Chances are about even that Brian is a rhino. It is certain that Mary went to the garden. Chances are about even that Winona is a wolf. It is highly likely that if Winona is a wolf, or Brian is a rhino, then Gertrude is a cat. There is a better than even chance that if Winona is a wolf, and Brian is a rhino, then Greg is a frog. It is probably not the case that if Mary went to the garden, and Winona is a wolf, then Julius is a lion.
hypothesis: It is probable that gertrude is a cat, or Greg is a frog.
valid_hypothesis: It is probable that gertrude is a cat, or Greg is a frog.
invalid_hypothesis: There is almost no chance that gertrude is a cat, or Greg is a frog.
hypothesis_assertion: Gertrude is a cat, or Greg is a frog.