context: We doubt that Winona is a cat. There is little chance that Lily is yellow. It is highly unlikely that Sandra took the football. We believe that if Sandra took the football, or Winona is a cat, then Fred is in the office. It is almost certain that if Winona is a cat, and Lily is yellow, then Gertrude is a mouse. It is probable that if Lily is yellow, or Sandra took the football, then Brian is a lion.
hypothesis: It is almost certain that fred is in the office, and Brian is a lion.
valid_hypothesis: It is highly unlikely that fred is in the office, and Brian is a lion.
invalid_hypothesis: It is almost certain that fred is in the office, and Brian is a lion.
hypothesis_assertion: Fred is in the office, and Brian is a lion.