context: We believe that Bernhard is a frog. There is a very good chance that Brian is white. It is improbable that Julius is a swan.
hypothesis: We believe that either Julius is a swan, or Brian is white.
valid_hypothesis: We believe that either Julius is a swan, or Brian is white.
invalid_hypothesis: There is little chance that either Julius is a swan, or Brian is white.
hypothesis_assertion: Either Julius is a swan, or Brian is white.