context: It is probably the case that Daniel left the milk. There is little chance that Brian is green. Chances are about even that Bernhard is a lion. We believe that if either Brian is green, or Daniel left the milk, then Julie is in the kitchen. We doubt that if either Daniel left the milk, or Brian is green, then Julius is a swan. There is a better than even chance that if Bernhard is a lion, and Daniel left the milk, then Greg is gray.
hypothesis: It is probably not the case that either Greg is gray, or Bernhard is a lion.
valid_hypothesis: It is probably not the case that either Greg is gray, or Bernhard is a lion.
invalid_hypothesis: It is certain that either Greg is gray, or Bernhard is a lion.
hypothesis_assertion: Either Greg is gray, or Bernhard is a lion.