context: It is impossible that Sandra dropped the milk. It is probable that Lily is white. It is highly unlikely that Bill is in the school. It is highly unlikely that if Bill is in the school, and Sandra dropped the milk, then Julius is green. It is improbable that if either Sandra dropped the milk, or Bill is in the school, then Greg is yellow. It is highly unlikely that if Lily is white, or Bill is in the school, then Brian is a swan.
hypothesis: It is highly unlikely that brian is a swan, and Lily is white.
valid_hypothesis: It is highly unlikely that brian is a swan, and Lily is white.
invalid_hypothesis: It is probable that brian is a swan, and Lily is white.
hypothesis_assertion: Brian is a swan, and Lily is white.