context: Chances are slight that Julie is in the office. It is improbable that Brian is a swan. It is highly likely that Julius is gray. It is highly unlikely that if Brian is a swan, or Julius is gray, then Sandra got the football. It is improbable that if Julius is gray, or Brian is a swan, then John grabbed the milk. It is almost certain that if either Brian is a swan, or Julie is in the office, then Mary went to the kitchen.
hypothesis: There is little chance that julie is in the office, and Mary went to the kitchen.
valid_hypothesis: There is little chance that julie is in the office, and Mary went to the kitchen.
invalid_hypothesis: We believe that julie is in the office, and Mary went to the kitchen.
hypothesis_assertion: Julie is in the office, and Mary went to the kitchen.