context: Chances are about even that Mary went to the hallway. It is probably the case that Brian is gray. Chances are slight that Lily is white.
hypothesis: It is highly unlikely that lily is white, or Brian is gray.
valid_hypothesis: We believe that lily is white, or Brian is gray.
invalid_hypothesis: It is highly unlikely that lily is white, or Brian is gray.
hypothesis_assertion: Lily is white, or Brian is gray.