context: It is likely that Julius is green. Chances are about even that John went to the hallway. There is almost no chance that Lily is a swan. It is probably not the case that if either Julius is green, or Lily is a swan, then Bernhard is a lion. It is highly unlikely that if Lily is a swan, and John went to the hallway, then Sandra left the milk. It is unlikely that if either John went to the hallway, or Julius is green, then Greg is gray.
hypothesis: It is probable that greg is gray, and Sandra left the milk.
valid_hypothesis: It is impossible that greg is gray, and Sandra left the milk.
invalid_hypothesis: It is probable that greg is gray, and Sandra left the milk.
hypothesis_assertion: Greg is gray, and Sandra left the milk.