context: Chances are about even that Lily is white. There is little chance that John went to the garden. Chances are slight that Mary moved to the office. It is almost certain that if either John went to the garden, or Lily is white, then Daniel dropped the milk. There is little chance that if either John went to the garden, or Mary moved to the office, then Sandra got the football. It is probably the case that if Mary moved to the office, or John went to the garden, then Greg is gray.
hypothesis: It is certain that either Lily is white, or Greg is gray.
valid_hypothesis: Chances are about even that either Lily is white, or Greg is gray.
invalid_hypothesis: It is certain that either Lily is white, or Greg is gray.
hypothesis_assertion: Either Lily is white, or Greg is gray.