context: It is impossible that Julius is a swan. Chances are slight that Bernhard is green. It is impossible that Greg is a lion.
hypothesis: It is impossible that julius is a swan, and Bernhard is green.
valid_hypothesis: It is impossible that julius is a swan, and Bernhard is green.
invalid_hypothesis: It is likely that julius is a swan, and Bernhard is green.
hypothesis_assertion: Julius is a swan, and Bernhard is green.