context: It is highly likely that Lily is white. Chances are about even that Greg is a rhino. There is a very good chance that Brian is a frog. Chances are about even that if Brian is a frog, and Lily is white, then Julius is gray. Chances are about even that if Brian is a frog, and Lily is white, then Bernhard is a lion. There is almost no chance that if either Brian is a frog, or Greg is a rhino, then Mary moved to the office.
hypothesis: It is impossible that mary moved to the office, and Lily is white.
valid_hypothesis: It is impossible that mary moved to the office, and Lily is white.
invalid_hypothesis: Chances are about even that mary moved to the office, and Lily is white.
hypothesis_assertion: Mary moved to the office, and Lily is white.