context: Chances are slight that Greg is a lion. There is little chance that Mary went to the office. It is impossible that Lily is a rhino. It is probably not the case that if Greg is a lion, and Lily is a rhino, then Gertrude is a mouse. Chances are about even that if Mary went to the office, and Greg is a lion, then John got the milk. It is probably not the case that if either Greg is a lion, or Mary went to the office, then Brian is a frog.
hypothesis: It is impossible that john got the milk, and Lily is a rhino.
valid_hypothesis: It is impossible that john got the milk, and Lily is a rhino.
invalid_hypothesis: It is highly likely that john got the milk, and Lily is a rhino.
hypothesis_assertion: John got the milk, and Lily is a rhino.