context: There is a very good chance that Julius is green. Chances are about even that Mary went to the bedroom. There is little chance that John picked up the apple. It is probably not the case that if either Mary went to the bedroom, or John picked up the apple, then Bernhard is a swan. There is a very good chance that if John picked up the apple, or Julius is green, then Brian is a lion. There is little chance that if Mary went to the bedroom, and Julius is green, then Fred left the football.
hypothesis: It is probable that either Julius is green, or Brian is a lion.
valid_hypothesis: We doubt that either Julius is green, or Brian is a lion.
invalid_hypothesis: It is probable that either Julius is green, or Brian is a lion.
hypothesis_assertion: Either Julius is green, or Brian is a lion.