context: We believe that John picked up the apple. It is certain that Brian is a lion. Chances are slight that Lily is yellow. It is probably not the case that if Lily is yellow, or John picked up the apple, then Bernhard is gray. It is highly likely that if John picked up the apple, or Lily is yellow, then Mary went to the hallway. It is likely that if John picked up the apple, and Brian is a lion, then Julius is a swan.
hypothesis: There is almost no chance that julius is a swan, and Mary went to the hallway.
valid_hypothesis: Chances are about even that julius is a swan, and Mary went to the hallway.
invalid_hypothesis: There is almost no chance that julius is a swan, and Mary went to the hallway.
hypothesis_assertion: Julius is a swan, and Mary went to the hallway.