context: We doubt that Greg is a rhino. We believe that Sandra took the apple. It is highly unlikely that Lily is gray. Chances are about even that if Sandra took the apple, and Greg is a rhino, then Bill went to the garden. It is probably not the case that if Sandra took the apple, or Greg is a rhino, then Julius is gray. There is almost no chance that if either Sandra took the apple, or Greg is a rhino, then Brian is green.
hypothesis: It is highly likely that lily is gray, or Julius is gray.
valid_hypothesis: It is probably not the case that lily is gray, or Julius is gray.
invalid_hypothesis: It is highly likely that lily is gray, or Julius is gray.
hypothesis_assertion: Lily is gray, or Julius is gray.