context: Chances are about even that Mary went to the garden. It is unlikely that Julius is a swan. We doubt that Fred is in the park. There is little chance that if Mary went to the garden, and Fred is in the park, then Antoine is thirsty. There is a very good chance that if Fred is in the park, and Julius is a swan, then Lily is a lion. There is a very good chance that if Julius is a swan, or Fred is in the park, then Brian is white.
hypothesis: There is a better than even chance that julius is a swan, or Mary went to the garden.
valid_hypothesis: There is a better than even chance that julius is a swan, or Mary went to the garden.
invalid_hypothesis: It is highly unlikely that julius is a swan, or Mary went to the garden.
hypothesis_assertion: Julius is a swan, or Mary went to the garden.