context: It is probably not the case that Sandra left the milk. There is a better than even chance that Greg is a swan. There is little chance that Mary put down the apple.
hypothesis: It is highly unlikely that mary put down the apple, and Greg is a swan.
valid_hypothesis: It is highly unlikely that mary put down the apple, and Greg is a swan.
invalid_hypothesis: Chances are about even that mary put down the apple, and Greg is a swan.
hypothesis_assertion: Mary put down the apple, and Greg is a swan.