context: It is highly likely that Brian is a lion. We believe that Greg is green. It is improbable that Bernhard is a rhino. It is improbable that if Brian is a lion, or Greg is green, then Bill is in the school. There is little chance that if Bernhard is a rhino, and Brian is a lion, then John went to the hallway. It is highly unlikely that if either Bernhard is a rhino, or Greg is green, then Fred left the football.
hypothesis: It is probable that bill is in the school, or John went to the hallway.
valid_hypothesis: Chances are slight that bill is in the school, or John went to the hallway.
invalid_hypothesis: It is probable that bill is in the school, or John went to the hallway.
hypothesis_assertion: Bill is in the school, or John went to the hallway.