context: Chances are about even that Sandra got the apple. There is little chance that Bill moved to the office. It is improbable that Brian is green. Chances are slight that if either Sandra got the apple, or Bill moved to the office, then Greg is a swan. It is highly likely that if either Bill moved to the office, or Sandra got the apple, then John left the milk. Chances are slight that if Bill moved to the office, and Sandra got the apple, then Julius is yellow.
hypothesis: It is impossible that either Greg is a swan, or Sandra got the apple.
valid_hypothesis: Chances are about even that either Greg is a swan, or Sandra got the apple.
invalid_hypothesis: It is impossible that either Greg is a swan, or Sandra got the apple.
hypothesis_assertion: Either Greg is a swan, or Sandra got the apple.