context: It is probable that Bernhard is a swan. It is improbable that Fred discarded the milk. There is a better than even chance that Winona is a wolf. There is little chance that if either Winona is a wolf, or Fred discarded the milk, then John went to the hallway. Chances are about even that if either Fred discarded the milk, or Bernhard is a swan, then Mary dropped the milk. It is almost certain that if either Fred discarded the milk, or Bernhard is a swan, then Brian is yellow.
hypothesis: It is impossible that john went to the hallway, and Fred discarded the milk.
valid_hypothesis: It is impossible that john went to the hallway, and Fred discarded the milk.
invalid_hypothesis: It is almost certain that john went to the hallway, and Fred discarded the milk.
hypothesis_assertion: John went to the hallway, and Fred discarded the milk.