context: We doubt that Greg is a swan. It is likely that Mary went to the office. There is almost no chance that Julius is a lion.
hypothesis: It is impossible that julius is a lion, and Greg is a swan.
valid_hypothesis: It is impossible that julius is a lion, and Greg is a swan.
invalid_hypothesis: It is highly likely that julius is a lion, and Greg is a swan.
hypothesis_assertion: Julius is a lion, and Greg is a swan.