context: It is probably not the case that Julius is a rhino. Chances are about even that John went to the garden. There is almost no chance that Mary moved to the garden. Chances are slight that if Julius is a rhino, or John went to the garden, then Greg is green. It is certain that if John went to the garden, and Mary moved to the garden, then Sandra left the milk. We doubt that if Julius is a rhino, or John went to the garden, then Lily is a swan.
hypothesis: There is a very good chance that either Greg is green, or Lily is a swan.
valid_hypothesis: We doubt that either Greg is green, or Lily is a swan.
invalid_hypothesis: There is a very good chance that either Greg is green, or Lily is a swan.
hypothesis_assertion: Either Greg is green, or Lily is a swan.