context: There is a very good chance that Julius is a rhino. We believe that Greg is yellow. We doubt that John left the apple. We doubt that if Julius is a rhino, or Greg is yellow, then Lily is green. There is a very good chance that if Greg is yellow, and Julius is a rhino, then Mary went to the office. Chances are about even that if Greg is yellow, or Julius is a rhino, then Brian is a swan.
hypothesis: It is certain that either Greg is yellow, or Brian is a swan.
valid_hypothesis: Chances are about even that either Greg is yellow, or Brian is a swan.
invalid_hypothesis: It is certain that either Greg is yellow, or Brian is a swan.
hypothesis_assertion: Either Greg is yellow, or Brian is a swan.