context: It is certain that Emily is a wolf. It is probably not the case that Mary picked up the milk. Chances are slight that Greg is yellow. It is improbable that if Greg is yellow, and Emily is a wolf, then Brian is gray. It is impossible that if Greg is yellow, and Emily is a wolf, then John moved to the office. It is probably not the case that if either Emily is a wolf, or Mary picked up the milk, then Jeff discarded the apple.
hypothesis: It is impossible that jeff discarded the apple, and Brian is gray.
valid_hypothesis: It is impossible that jeff discarded the apple, and Brian is gray.
invalid_hypothesis: Chances are about even that jeff discarded the apple, and Brian is gray.
hypothesis_assertion: Jeff discarded the apple, and Brian is gray.