context: It is almost certain that Mary took the apple. It is impossible that Fred dropped the apple. It is likely that Brian is a rhino. There is a very good chance that if either Mary took the apple, or Fred dropped the apple, then John went to the kitchen. There is little chance that if Brian is a rhino, or Fred dropped the apple, then Lily is a frog. Chances are slight that if either Fred dropped the apple, or Mary took the apple, then Sandra got the football.
hypothesis: It is likely that either Fred dropped the apple, or Brian is a rhino.
valid_hypothesis: It is likely that either Fred dropped the apple, or Brian is a rhino.
invalid_hypothesis: It is highly unlikely that either Fred dropped the apple, or Brian is a rhino.
hypothesis_assertion: Either Fred dropped the apple, or Brian is a rhino.