context: We believe that Brian is a lion. It is almost certain that Mary is in the garden. It is improbable that Julius is a swan.
hypothesis: It is improbable that julius is a swan, and Brian is a lion.
valid_hypothesis: It is improbable that julius is a swan, and Brian is a lion.
invalid_hypothesis: There is a very good chance that julius is a swan, and Brian is a lion.
hypothesis_assertion: Julius is a swan, and Brian is a lion.