context: It is probably the case that Lily is a swan. There is almost no chance that John went to the hallway. It is improbable that Mary picked up the milk. It is highly likely that if John went to the hallway, or Mary picked up the milk, then Greg is gray. It is unlikely that if John went to the hallway, and Mary picked up the milk, then Julius is a frog. We believe that if John went to the hallway, or Lily is a swan, then Brian is green.
hypothesis: There is a very good chance that brian is green, and Greg is gray.
valid_hypothesis: It is highly unlikely that brian is green, and Greg is gray.
invalid_hypothesis: There is a very good chance that brian is green, and Greg is gray.
hypothesis_assertion: Brian is green, and Greg is gray.