context: Chances are slight that Brian is a swan. We doubt that Mary moved to the office. There is little chance that Jessica is a wolf. It is impossible that if Mary moved to the office, or Brian is a swan, then Bernhard is gray. It is highly unlikely that if Brian is a swan, and Jessica is a wolf, then Sandra put down the milk. We doubt that if either Mary moved to the office, or Jessica is a wolf, then Sumit is thirsty.
hypothesis: It is probably the case that either Brian is a swan, or Sandra put down the milk.
valid_hypothesis: It is improbable that either Brian is a swan, or Sandra put down the milk.
invalid_hypothesis: It is probably the case that either Brian is a swan, or Sandra put down the milk.
hypothesis_assertion: Either Brian is a swan, or Sandra put down the milk.