context: It is likely that Julius is a swan. It is impossible that Greg is a rhino. We believe that Antoine is hungry. It is improbable that if Julius is a swan, or Greg is a rhino, then Brian is a frog. Chances are about even that if Antoine is hungry, and Greg is a rhino, then Mary put down the milk. There is a better than even chance that if either Antoine is hungry, or Julius is a swan, then John went to the office.
hypothesis: It is certain that either Greg is a rhino, or Mary put down the milk.
valid_hypothesis: It is impossible that either Greg is a rhino, or Mary put down the milk.
invalid_hypothesis: It is certain that either Greg is a rhino, or Mary put down the milk.
hypothesis_assertion: Either Greg is a rhino, or Mary put down the milk.