context: It is improbable that John put down the apple. It is probably not the case that Bill went to the hallway. We believe that Julius is a rhino. It is highly unlikely that if either John put down the apple, or Julius is a rhino, then Greg is a frog. It is almost certain that if Julius is a rhino, or John put down the apple, then Sandra left the milk. Chances are about even that if either John put down the apple, or Julius is a rhino, then Mary moved to the office.
hypothesis: It is highly unlikely that either Julius is a rhino, or Sandra left the milk.
valid_hypothesis: It is highly unlikely that either Julius is a rhino, or Sandra left the milk.
invalid_hypothesis: There is a better than even chance that either Julius is a rhino, or Sandra left the milk.
hypothesis_assertion: Either Julius is a rhino, or Sandra left the milk.