context: It is highly unlikely that Greg is yellow. There is a very good chance that Mary left the milk. We doubt that Brian is gray. We doubt that if Greg is yellow, and Brian is gray, then John took the apple. It is certain that if Mary left the milk, and Brian is gray, then Bernhard is a lion. It is almost certain that if either Brian is gray, or Greg is yellow, then Julius is a swan.
hypothesis: It is unlikely that either John took the apple, or Julius is a swan.
valid_hypothesis: It is unlikely that either John took the apple, or Julius is a swan.
invalid_hypothesis: We believe that either John took the apple, or Julius is a swan.
hypothesis_assertion: Either John took the apple, or Julius is a swan.