context: It is improbable that Greg is yellow. It is highly unlikely that Yann is tired. We believe that Lily is a swan. It is impossible that if Greg is yellow, and Lily is a swan, then Jessica is a mouse. There is little chance that if Yann is tired, or Greg is yellow, then Fred left the milk. There is little chance that if Yann is tired, or Greg is yellow, then Julius is white.
hypothesis: It is impossible that fred left the milk, and Yann is tired.
valid_hypothesis: It is impossible that fred left the milk, and Yann is tired.
invalid_hypothesis: There is a very good chance that fred left the milk, and Yann is tired.
hypothesis_assertion: Fred left the milk, and Yann is tired.