context: There is little chance that Brian is a swan. It is highly unlikely that Greg is a lion. It is impossible that Sandra took the apple.
hypothesis: We believe that either Greg is a lion, or Brian is a swan.
valid_hypothesis: It is improbable that either Greg is a lion, or Brian is a swan.
invalid_hypothesis: We believe that either Greg is a lion, or Brian is a swan.
hypothesis_assertion: Either Greg is a lion, or Brian is a swan.