context: Chances are slight that Mary left the football. There is almost no chance that Bernhard is a swan. We believe that Julius is a frog.
hypothesis: Chances are slight that either Bernhard is a swan, or Mary left the football.
valid_hypothesis: Chances are slight that either Bernhard is a swan, or Mary left the football.
invalid_hypothesis: There is a better than even chance that either Bernhard is a swan, or Mary left the football.
hypothesis_assertion: Either Bernhard is a swan, or Mary left the football.