context: It is highly unlikely that Julius is white. Chances are about even that Lily is a lion. It is impossible that Mary moved to the garden. It is impossible that if Lily is a lion, or Mary moved to the garden, then Brian is a swan. There is a better than even chance that if Mary moved to the garden, or Lily is a lion, then John picked up the apple. Chances are slight that if Mary moved to the garden, and Julius is white, then Greg is gray.
hypothesis: Chances are about even that either Julius is white, or Brian is a swan.
valid_hypothesis: It is highly unlikely that either Julius is white, or Brian is a swan.
invalid_hypothesis: Chances are about even that either Julius is white, or Brian is a swan.
hypothesis_assertion: Either Julius is white, or Brian is a swan.