context: It is probable that Bernhard is a lion. There is a very good chance that Mary went to the kitchen. There is little chance that Sandra left the football. It is impossible that if Bernhard is a lion, and Sandra left the football, then Julius is gray. It is almost certain that if Sandra left the football, or Mary went to the kitchen, then Greg is a swan. It is unlikely that if Mary went to the kitchen, or Sandra left the football, then Brian is white.
hypothesis: It is unlikely that either Brian is white, or Julius is gray.
valid_hypothesis: It is unlikely that either Brian is white, or Julius is gray.
invalid_hypothesis: We believe that either Brian is white, or Julius is gray.
hypothesis_assertion: Either Brian is white, or Julius is gray.