context: It is likely that Brian is a rhino. There is almost no chance that Mary went to the kitchen. Chances are about even that John moved to the garden. We doubt that if John moved to the garden, and Brian is a rhino, then Jessica is a wolf. There is a better than even chance that if John moved to the garden, or Brian is a rhino, then Bernhard is a lion. It is highly unlikely that if Brian is a rhino, and Mary went to the kitchen, then Greg is a frog.
hypothesis: Chances are about even that either Brian is a rhino, or John moved to the garden.
valid_hypothesis: Chances are about even that either Brian is a rhino, or John moved to the garden.
invalid_hypothesis: There is almost no chance that either Brian is a rhino, or John moved to the garden.
hypothesis_assertion: Either Brian is a rhino, or John moved to the garden.