context: It is almost certain that Brian is a rhino. It is almost certain that John got the milk. It is highly likely that Greg is a frog. There is almost no chance that if John got the milk, and Greg is a frog, then Emily is a sheep. It is certain that if Brian is a rhino, or Greg is a frog, then Julius is a swan. There is little chance that if Brian is a rhino, or Greg is a frog, then Mary went to the bedroom.
hypothesis: Chances are slight that either Brian is a rhino, or Greg is a frog.
valid_hypothesis: Chances are slight that either Brian is a rhino, or Greg is a frog.
invalid_hypothesis: We believe that either Brian is a rhino, or Greg is a frog.
hypothesis_assertion: Either Brian is a rhino, or Greg is a frog.