context: Chances are slight that Bernhard is white. It is highly likely that Lily is a lion. Chances are about even that Brian is green. We believe that if Brian is green, or Lily is a lion, then John went to the garden. It is probable that if Bernhard is white, and Brian is green, then Greg is gray. It is impossible that if Lily is a lion, or Bernhard is white, then Mary got the milk.
hypothesis: It is highly unlikely that brian is green, and Lily is a lion.
valid_hypothesis: Chances are about even that brian is green, and Lily is a lion.
invalid_hypothesis: It is highly unlikely that brian is green, and Lily is a lion.
hypothesis_assertion: Brian is green, and Lily is a lion.