context: It is highly likely that Bill went to the cinema. It is probably not the case that Mary moved to the garden. It is certain that Brian is a swan. Chances are about even that if Bill went to the cinema, and Brian is a swan, then Antoine is hungry. It is highly unlikely that if Bill went to the cinema, or Mary moved to the garden, then Julius is gray. It is highly likely that if Bill went to the cinema, or Brian is a swan, then Daniel took the football.
hypothesis: It is certain that brian is a swan, or Julius is gray.
valid_hypothesis: It is certain that brian is a swan, or Julius is gray.
invalid_hypothesis: Chances are about even that brian is a swan, or Julius is gray.
hypothesis_assertion: Brian is a swan, or Julius is gray.