context: It is highly unlikely that Greg is a swan. Chances are about even that Julius is a rhino. It is unlikely that Bill went to the cinema.
hypothesis: It is probably not the case that either Greg is a swan, or Bill went to the cinema.
valid_hypothesis: It is probably not the case that either Greg is a swan, or Bill went to the cinema.
invalid_hypothesis: It is certain that either Greg is a swan, or Bill went to the cinema.
hypothesis_assertion: Either Greg is a swan, or Bill went to the cinema.