context: Chances are about even that Mary went to the hallway. It is unlikely that Bill left the milk. It is impossible that Emily is a wolf. It is certain that if Bill left the milk, or Emily is a wolf, then Winona is a cat. It is likely that if Mary went to the hallway, and Emily is a wolf, then Fred is in the school. It is unlikely that if either Bill left the milk, or Emily is a wolf, then Greg is a frog.
hypothesis: It is probably the case that greg is a frog, and Bill left the milk.
valid_hypothesis: It is highly unlikely that greg is a frog, and Bill left the milk.
invalid_hypothesis: It is probably the case that greg is a frog, and Bill left the milk.
hypothesis_assertion: Greg is a frog, and Bill left the milk.