context: There is a very good chance that Sandra took the apple. There is little chance that Bernhard is white. It is improbable that Brian is a frog. There is a better than even chance that if either Bernhard is white, or Sandra took the apple, then Fred discarded the milk. It is probable that if either Bernhard is white, or Brian is a frog, then Bill went to the garden. There is little chance that if Sandra took the apple, or Bernhard is white, then John put down the apple.
hypothesis: Chances are about even that either Brian is a frog, or Fred discarded the milk.
valid_hypothesis: Chances are about even that either Brian is a frog, or Fred discarded the milk.
invalid_hypothesis: It is certain that either Brian is a frog, or Fred discarded the milk.
hypothesis_assertion: Either Brian is a frog, or Fred discarded the milk.