context: It is highly unlikely that Lily is a swan. It is probable that Julius is a rhino. It is improbable that Mary went to the hallway. Chances are about even that if Lily is a swan, and Mary went to the hallway, then Gertrude is a cat. It is impossible that if Lily is a swan, or Julius is a rhino, then Sandra took the milk. It is probable that if Lily is a swan, or Julius is a rhino, then Brian is gray.
hypothesis: We believe that mary went to the hallway, or Lily is a swan.
valid_hypothesis: Chances are slight that mary went to the hallway, or Lily is a swan.
invalid_hypothesis: We believe that mary went to the hallway, or Lily is a swan.
hypothesis_assertion: Mary went to the hallway, or Lily is a swan.