context: Chances are slight that Lily is a rhino. It is impossible that Julius is a swan. It is probable that Brian is green.
hypothesis: It is probable that brian is green, or Julius is a swan.
valid_hypothesis: It is probable that brian is green, or Julius is a swan.
invalid_hypothesis: It is impossible that brian is green, or Julius is a swan.
hypothesis_assertion: Brian is green, or Julius is a swan.