context: There is little chance that Mary took the apple. Chances are about even that Julius is gray. Chances are slight that Greg is a rhino. It is improbable that if either Mary took the apple, or Julius is gray, then Gertrude is a sheep. We doubt that if Greg is a rhino, and Mary took the apple, then John went to the bedroom. It is improbable that if Mary took the apple, or Greg is a rhino, then Brian is white.
hypothesis: It is likely that either Brian is white, or Greg is a rhino.
valid_hypothesis: There is little chance that either Brian is white, or Greg is a rhino.
invalid_hypothesis: It is likely that either Brian is white, or Greg is a rhino.
hypothesis_assertion: Either Brian is white, or Greg is a rhino.