context: It is highly unlikely that Jeff dropped the apple. There is almost no chance that Daniel took the football. There is little chance that Julius is a frog. It is highly unlikely that if Daniel took the football, and Julius is a frog, then Brian is a rhino. It is almost certain that if either Daniel took the football, or Julius is a frog, then Sandra left the milk. There is a very good chance that if Jeff dropped the apple, and Julius is a frog, then Mary went to the kitchen.
hypothesis: It is certain that julius is a frog, and Sandra left the milk.
valid_hypothesis: It is improbable that julius is a frog, and Sandra left the milk.
invalid_hypothesis: It is certain that julius is a frog, and Sandra left the milk.
hypothesis_assertion: Julius is a frog, and Sandra left the milk.