context: It is certain that Brian is a lion. We believe that Bernhard is a rhino. It is probably the case that Greg is gray. We believe that if either Bernhard is a rhino, or Greg is gray, then Winona is a mouse. It is improbable that if either Greg is gray, or Bernhard is a rhino, then Mary went to the hallway. It is improbable that if Greg is gray, and Bernhard is a rhino, then Julius is a swan.
hypothesis: It is highly unlikely that mary went to the hallway, and Brian is a lion.
valid_hypothesis: It is highly unlikely that mary went to the hallway, and Brian is a lion.
invalid_hypothesis: It is highly likely that mary went to the hallway, and Brian is a lion.
hypothesis_assertion: Mary went to the hallway, and Brian is a lion.