context: Chances are slight that Julius is a rhino. It is highly unlikely that Gertrude is a mouse. There is almost no chance that Mary moved to the office. Chances are slight that if Mary moved to the office, or Julius is a rhino, then John got the apple. We doubt that if Gertrude is a mouse, or Mary moved to the office, then Greg is a swan. We doubt that if either Julius is a rhino, or Mary moved to the office, then Brian is a lion.
hypothesis: It is impossible that mary moved to the office, and Gertrude is a mouse.
valid_hypothesis: It is impossible that mary moved to the office, and Gertrude is a mouse.
invalid_hypothesis: There is a better than even chance that mary moved to the office, and Gertrude is a mouse.
hypothesis_assertion: Mary moved to the office, and Gertrude is a mouse.