context: It is almost certain that Brian is green. Chances are slight that Julius is green. There is almost no chance that Greg is a swan.
hypothesis: There is a better than even chance that julius is green, and Greg is a swan.
valid_hypothesis: It is impossible that julius is green, and Greg is a swan.
invalid_hypothesis: There is a better than even chance that julius is green, and Greg is a swan.
hypothesis_assertion: Julius is green, and Greg is a swan.