context: It is certain that Emily is a mouse. Chances are about even that Brian is a swan. It is highly unlikely that Mary moved to the office. It is almost certain that if Emily is a mouse, and Brian is a swan, then Lily is gray. It is impossible that if Mary moved to the office, or Brian is a swan, then Julius is a rhino. There is a very good chance that if Emily is a mouse, and Brian is a swan, then John got the milk.
hypothesis: There is a very good chance that mary moved to the office, and Emily is a mouse.
valid_hypothesis: It is highly unlikely that mary moved to the office, and Emily is a mouse.
invalid_hypothesis: There is a very good chance that mary moved to the office, and Emily is a mouse.
hypothesis_assertion: Mary moved to the office, and Emily is a mouse.