context: It is almost certain that Brian is white. It is almost certain that Greg is a swan. Chances are about even that John went to the bedroom. We believe that if Greg is a swan, or John went to the bedroom, then Julius is a rhino. There is almost no chance that if Greg is a swan, or John went to the bedroom, then Mary put down the apple. There is almost no chance that if Brian is white, or John went to the bedroom, then Bill moved to the garden.
hypothesis: Chances are about even that either John went to the bedroom, or Greg is a swan.
valid_hypothesis: Chances are about even that either John went to the bedroom, or Greg is a swan.
invalid_hypothesis: It is certain that either John went to the bedroom, or Greg is a swan.
hypothesis_assertion: Either John went to the bedroom, or Greg is a swan.