context: Chances are slight that John picked up the milk. It is unlikely that Greg is a swan. It is highly likely that Brian is a frog.
hypothesis: We believe that either Greg is a swan, or Brian is a frog.
valid_hypothesis: We believe that either Greg is a swan, or Brian is a frog.
invalid_hypothesis: We doubt that either Greg is a swan, or Brian is a frog.
hypothesis_assertion: Either Greg is a swan, or Brian is a frog.