context: It is improbable that Lily is gray. Chances are slight that Julius is a lion. It is unlikely that John dropped the apple. We doubt that if either Lily is gray, or Julius is a lion, then Daniel left the milk. We doubt that if Julius is a lion, or John dropped the apple, then Brian is a rhino. There is a better than even chance that if either Lily is gray, or John dropped the apple, then Mary is in the office.
hypothesis: It is probably the case that either Brian is a rhino, or Lily is gray.
valid_hypothesis: It is improbable that either Brian is a rhino, or Lily is gray.
invalid_hypothesis: It is probably the case that either Brian is a rhino, or Lily is gray.
hypothesis_assertion: Either Brian is a rhino, or Lily is gray.