context: We believe that Fred went to the hallway. There is little chance that Brian is a swan. There is a better than even chance that Lily is a frog. It is highly unlikely that if Lily is a frog, or Brian is a swan, then Mary moved to the office. It is improbable that if Fred went to the hallway, and Lily is a frog, then John put down the milk. It is highly likely that if either Fred went to the hallway, or Lily is a frog, then Greg is white.
hypothesis: Chances are about even that either Greg is white, or Mary moved to the office.
valid_hypothesis: Chances are about even that either Greg is white, or Mary moved to the office.
invalid_hypothesis: It is highly unlikely that either Greg is white, or Mary moved to the office.
hypothesis_assertion: Either Greg is white, or Mary moved to the office.