context: We doubt that Greg is a lion. Chances are about even that John got the milk. It is highly unlikely that Winona is a cat. It is likely that if either John got the milk, or Winona is a cat, then Bernhard is a rhino. It is likely that if either John got the milk, or Winona is a cat, then Brian is a swan. It is impossible that if either John got the milk, or Winona is a cat, then Daniel left the football.
hypothesis: Chances are about even that either Greg is a lion, or Brian is a swan.
valid_hypothesis: Chances are about even that either Greg is a lion, or Brian is a swan.
invalid_hypothesis: It is almost certain that either Greg is a lion, or Brian is a swan.
hypothesis_assertion: Either Greg is a lion, or Brian is a swan.