context: It is unlikely that Fred went to the hallway. There is little chance that Mary put down the apple. There is little chance that Julius is white. It is certain that if Fred went to the hallway, and Julius is white, then Brian is gray. It is probable that if Mary put down the apple, and Fred went to the hallway, then Greg is a swan. There is little chance that if either Fred went to the hallway, or Mary put down the apple, then Emily is a cat.
hypothesis: It is certain that greg is a swan, or Mary put down the apple.
valid_hypothesis: It is improbable that greg is a swan, or Mary put down the apple.
invalid_hypothesis: It is certain that greg is a swan, or Mary put down the apple.
hypothesis_assertion: Greg is a swan, or Mary put down the apple.