context: It is probably the case that Brian is gray. It is likely that John went to the hallway. There is little chance that Greg is a rhino. There is a very good chance that if Greg is a rhino, or John went to the hallway, then Mary moved to the office. It is probably not the case that if either Greg is a rhino, or John went to the hallway, then Lily is white. There is little chance that if Greg is a rhino, or John went to the hallway, then Julius is a frog.
hypothesis: Chances are about even that mary moved to the office, and Brian is gray.
valid_hypothesis: Chances are about even that mary moved to the office, and Brian is gray.
invalid_hypothesis: It is highly unlikely that mary moved to the office, and Brian is gray.
hypothesis_assertion: Mary moved to the office, and Brian is gray.