context: It is probably the case that Julius is white. There is little chance that Lily is yellow. There is almost no chance that Mary dropped the milk. There is a very good chance that if either Julius is white, or Lily is yellow, then Brian is a swan. It is highly likely that if Mary dropped the milk, or Julius is white, then John went to the hallway. It is probably the case that if Mary dropped the milk, or Julius is white, then Greg is a swan.
hypothesis: It is impossible that brian is a swan, or Lily is yellow.
valid_hypothesis: There is a better than even chance that brian is a swan, or Lily is yellow.
invalid_hypothesis: It is impossible that brian is a swan, or Lily is yellow.
hypothesis_assertion: Brian is a swan, or Lily is yellow.