context: We believe that John picked up the apple. It is impossible that Gertrude is a mouse. There is little chance that Mary put down the milk. It is probably not the case that if Mary put down the milk, or John picked up the apple, then Brian is a lion. It is certain that if either Gertrude is a mouse, or John picked up the apple, then Greg is a swan. There is a better than even chance that if John picked up the apple, and Gertrude is a mouse, then Julius is gray.
hypothesis: There is a very good chance that greg is a swan, or Mary put down the milk.
valid_hypothesis: There is a very good chance that greg is a swan, or Mary put down the milk.
invalid_hypothesis: There is little chance that greg is a swan, or Mary put down the milk.
hypothesis_assertion: Greg is a swan, or Mary put down the milk.