context: It is unlikely that Julius is a rhino. It is impossible that Sandra took the football. Chances are slight that Daniel got the apple. We believe that if Julius is a rhino, and Daniel got the apple, then Winona is a mouse. There is almost no chance that if Julius is a rhino, or Sandra took the football, then Mary dropped the milk. There is a better than even chance that if Julius is a rhino, or Sandra took the football, then Fred went to the hallway.
hypothesis: It is impossible that julius is a rhino, and Mary dropped the milk.
valid_hypothesis: It is impossible that julius is a rhino, and Mary dropped the milk.
invalid_hypothesis: It is almost certain that julius is a rhino, and Mary dropped the milk.
hypothesis_assertion: Julius is a rhino, and Mary dropped the milk.