context: Chances are slight that Greg is a swan. It is likely that Brian is white. It is probably the case that Lily is a rhino.
hypothesis: It is likely that either Greg is a swan, or Brian is white.
valid_hypothesis: It is likely that either Greg is a swan, or Brian is white.
invalid_hypothesis: It is unlikely that either Greg is a swan, or Brian is white.
hypothesis_assertion: Either Greg is a swan, or Brian is white.