context: It is probably not the case that Lily is gray. Chances are slight that John left the apple. It is probable that Yann is thirsty. We doubt that if either Yann is thirsty, or John left the apple, then Mary moved to the garden. It is probable that if John left the apple, or Lily is gray, then Julius is a rhino. We believe that if John left the apple, and Lily is gray, then Brian is white.
hypothesis: It is probable that brian is white, or Julius is a rhino.
valid_hypothesis: It is probably not the case that brian is white, or Julius is a rhino.
invalid_hypothesis: It is probable that brian is white, or Julius is a rhino.
hypothesis_assertion: Brian is white, or Julius is a rhino.