context: It is probable that Brian is a lion. We doubt that Julius is white. It is impossible that Fred went to the kitchen. It is highly unlikely that if Brian is a lion, or Fred went to the kitchen, then Mary got the milk. It is highly likely that if either Julius is white, or Brian is a lion, then Gertrude is a cat. It is highly likely that if Brian is a lion, or Julius is white, then Lily is a swan.
hypothesis: We believe that brian is a lion, or Lily is a swan.
valid_hypothesis: We believe that brian is a lion, or Lily is a swan.
invalid_hypothesis: It is impossible that brian is a lion, or Lily is a swan.
hypothesis_assertion: Brian is a lion, or Lily is a swan.