context: It is unlikely that Mary dropped the milk. It is probably not the case that Brian is a swan. Chances are slight that Gertrude is a cat. It is highly unlikely that if Mary dropped the milk, and Gertrude is a cat, then Greg is white. We believe that if Mary dropped the milk, or Brian is a swan, then John picked up the apple. It is impossible that if Mary dropped the milk, and Brian is a swan, then Sandra got the football.
hypothesis: It is unlikely that mary dropped the milk, or Greg is white.
valid_hypothesis: It is unlikely that mary dropped the milk, or Greg is white.
invalid_hypothesis: It is certain that mary dropped the milk, or Greg is white.
hypothesis_assertion: Mary dropped the milk, or Greg is white.