context: Chances are slight that John put down the milk. It is unlikely that Mary went to the hallway. It is impossible that Julius is a lion. It is highly unlikely that if either Julius is a lion, or Mary went to the hallway, then Lily is a swan. Chances are about even that if either Mary went to the hallway, or John put down the milk, then Yann is tired. There is a very good chance that if either Mary went to the hallway, or Julius is a lion, then Brian is green.
hypothesis: It is highly likely that either Yann is tired, or Lily is a swan.
valid_hypothesis: Chances are slight that either Yann is tired, or Lily is a swan.
invalid_hypothesis: It is highly likely that either Yann is tired, or Lily is a swan.
hypothesis_assertion: Either Yann is tired, or Lily is a swan.