context: It is certain that Greg is a rhino. There is little chance that Julius is white. There is a better than even chance that Brian is green. It is probable that if either Brian is green, or Julius is white, then Gertrude is a mouse. It is improbable that if Brian is green, and Julius is white, then Bernhard is a frog. There is a very good chance that if Julius is white, and Brian is green, then John discarded the milk.
hypothesis: Chances are about even that either Julius is white, or Gertrude is a mouse.
valid_hypothesis: Chances are about even that either Julius is white, or Gertrude is a mouse.
invalid_hypothesis: It is certain that either Julius is white, or Gertrude is a mouse.
hypothesis_assertion: Either Julius is white, or Gertrude is a mouse.