context: It is likely that Sandra grabbed the milk. We doubt that Brian is gray. It is highly likely that Lily is a lion. There is a better than even chance that if Brian is gray, or Sandra grabbed the milk, then Julius is a swan. It is improbable that if Brian is gray, or Lily is a lion, then Greg is white. It is highly likely that if Sandra grabbed the milk, and Brian is gray, then John moved to the garden.
hypothesis: It is highly unlikely that julius is a swan, and Greg is white.
valid_hypothesis: It is highly unlikely that julius is a swan, and Greg is white.
invalid_hypothesis: It is probable that julius is a swan, and Greg is white.
hypothesis_assertion: Julius is a swan, and Greg is white.