context: It is probably not the case that Daniel is in the office. We doubt that Mary went to the hallway. It is unlikely that Julius is a rhino. There is a very good chance that if Mary went to the hallway, and Daniel is in the office, then Lily is a swan. There is almost no chance that if Julius is a rhino, or Mary went to the hallway, then John discarded the milk. It is highly likely that if Julius is a rhino, and Mary went to the hallway, then Brian is a lion.
hypothesis: It is probable that brian is a lion, and Lily is a swan.
valid_hypothesis: It is impossible that brian is a lion, and Lily is a swan.
invalid_hypothesis: It is probable that brian is a lion, and Lily is a swan.
hypothesis_assertion: Brian is a lion, and Lily is a swan.