context: We believe that Greg is a lion. It is highly unlikely that Julius is gray. It is unlikely that Daniel left the football. There is a better than even chance that if Daniel left the football, or Greg is a lion, then Jessica is a mouse. It is probably the case that if Daniel left the football, or Greg is a lion, then Fred went to the hallway. There is little chance that if either Julius is gray, or Daniel left the football, then Bernhard is a swan.
hypothesis: There is almost no chance that fred went to the hallway, and Greg is a lion.
valid_hypothesis: Chances are about even that fred went to the hallway, and Greg is a lion.
invalid_hypothesis: There is almost no chance that fred went to the hallway, and Greg is a lion.
hypothesis_assertion: Fred went to the hallway, and Greg is a lion.