context: It is impossible that Brian is a swan. It is almost certain that Fred went to the hallway. It is probably the case that Emily is a mouse. There is a very good chance that if Emily is a mouse, and Fred went to the hallway, then Greg is a lion. It is improbable that if Emily is a mouse, and Brian is a swan, then Julius is green. It is improbable that if either Fred went to the hallway, or Brian is a swan, then John got the milk.
hypothesis: It is certain that emily is a mouse, or Fred went to the hallway.
valid_hypothesis: It is certain that emily is a mouse, or Fred went to the hallway.
invalid_hypothesis: There is little chance that emily is a mouse, or Fred went to the hallway.
hypothesis_assertion: Emily is a mouse, or Fred went to the hallway.