context: We believe that John got the apple. It is probable that Fred left the milk. Chances are about even that Sumit is thirsty. It is impossible that if either Sumit is thirsty, or John got the apple, then Greg is a swan. It is highly likely that if Fred left the milk, and Sumit is thirsty, then Brian is a lion. It is improbable that if Fred left the milk, or Sumit is thirsty, then Bernhard is yellow.
hypothesis: It is likely that brian is a lion, or Greg is a swan.
valid_hypothesis: It is probably not the case that brian is a lion, or Greg is a swan.
invalid_hypothesis: It is likely that brian is a lion, or Greg is a swan.
hypothesis_assertion: Brian is a lion, or Greg is a swan.