context: It is certain that Brian is a frog. It is probably not the case that Julius is green. It is highly unlikely that Mary dropped the apple. We believe that if Brian is a frog, and Mary dropped the apple, then Sandra grabbed the milk. There is little chance that if Julius is green, or Mary dropped the apple, then John went to the hallway. There is a better than even chance that if Brian is a frog, or Julius is green, then Bill moved to the office.
hypothesis: It is highly unlikely that either Brian is a frog, or Bill moved to the office.
valid_hypothesis: Chances are about even that either Brian is a frog, or Bill moved to the office.
invalid_hypothesis: It is highly unlikely that either Brian is a frog, or Bill moved to the office.
hypothesis_assertion: Either Brian is a frog, or Bill moved to the office.