context: There is little chance that John picked up the milk. We doubt that Gertrude is a cat. It is probable that Lily is a swan. Chances are about even that if John picked up the milk, or Lily is a swan, then Julius is a rhino. We believe that if John picked up the milk, or Lily is a swan, then Sandra left the milk. It is highly likely that if Gertrude is a cat, and Lily is a swan, then Brian is gray.
hypothesis: It is probably not the case that either Julius is a rhino, or Lily is a swan.
valid_hypothesis: It is probably not the case that either Julius is a rhino, or Lily is a swan.
invalid_hypothesis: We believe that either Julius is a rhino, or Lily is a swan.
hypothesis_assertion: Either Julius is a rhino, or Lily is a swan.