context: It is probably not the case that Greg is a frog. It is improbable that Mary went to the bedroom. There is little chance that John got the apple. We doubt that if either John got the apple, or Greg is a frog, then Brian is a lion. There is little chance that if Mary went to the bedroom, or Greg is a frog, then Bernhard is yellow. Chances are slight that if Greg is a frog, and Mary went to the bedroom, then Julius is a swan.
hypothesis: It is impossible that john got the apple, and Julius is a swan.
valid_hypothesis: It is impossible that john got the apple, and Julius is a swan.
invalid_hypothesis: There is a very good chance that john got the apple, and Julius is a swan.
hypothesis_assertion: John got the apple, and Julius is a swan.