context: There is a better than even chance that Mary put down the apple. There is a better than even chance that John went to the garden. It is likely that Greg is a rhino. It is improbable that if John went to the garden, or Greg is a rhino, then Brian is a swan. It is probable that if Greg is a rhino, and John went to the garden, then Sandra left the apple. We believe that if Mary put down the apple, or John went to the garden, then Julius is a frog.
hypothesis: It is impossible that either Brian is a swan, or Mary put down the apple.
valid_hypothesis: There is a better than even chance that either Brian is a swan, or Mary put down the apple.
invalid_hypothesis: It is impossible that either Brian is a swan, or Mary put down the apple.
hypothesis_assertion: Either Brian is a swan, or Mary put down the apple.