context: We doubt that Julius is white. It is highly likely that Sandra dropped the milk. Chances are slight that Mary went to the hallway. There is almost no chance that if Mary went to the hallway, or Julius is white, then Lily is a frog. It is likely that if Sandra dropped the milk, or Mary went to the hallway, then Brian is green. It is almost certain that if Mary went to the hallway, and Sandra dropped the milk, then Gertrude is a wolf.
hypothesis: It is improbable that either Mary went to the hallway, or Brian is green.
valid_hypothesis: There is a better than even chance that either Mary went to the hallway, or Brian is green.
invalid_hypothesis: It is improbable that either Mary went to the hallway, or Brian is green.
hypothesis_assertion: Either Mary went to the hallway, or Brian is green.