context: It is certain that Brian is gray. It is highly likely that Fred went to the hallway. It is probable that Mary moved to the garden. It is unlikely that if either Brian is gray, or Mary moved to the garden, then Julius is a swan. Chances are slight that if either Fred went to the hallway, or Brian is gray, then John dropped the apple. There is little chance that if Mary moved to the garden, and Fred went to the hallway, then Lily is a lion.
hypothesis: It is impossible that john dropped the apple, or Fred went to the hallway.
valid_hypothesis: It is highly likely that john dropped the apple, or Fred went to the hallway.
invalid_hypothesis: It is impossible that john dropped the apple, or Fred went to the hallway.
hypothesis_assertion: John dropped the apple, or Fred went to the hallway.