context: It is highly likely that Brian is green. It is probable that Bernhard is a swan. It is certain that Mary dropped the milk. There is a very good chance that if Brian is green, and Mary dropped the milk, then Julius is a lion. It is highly unlikely that if either Bernhard is a swan, or Mary dropped the milk, then Greg is a rhino. It is probably not the case that if Brian is green, and Bernhard is a swan, then John left the apple.
hypothesis: It is certain that either Mary dropped the milk, or Greg is a rhino.
valid_hypothesis: It is certain that either Mary dropped the milk, or Greg is a rhino.
invalid_hypothesis: It is improbable that either Mary dropped the milk, or Greg is a rhino.
hypothesis_assertion: Either Mary dropped the milk, or Greg is a rhino.