context: It is impossible that Brian is a rhino. It is probable that Mary dropped the milk. There is a very good chance that Sandra left the football. It is almost certain that if Sandra left the football, and Mary dropped the milk, then Bernhard is a swan. There is a very good chance that if Sandra left the football, or Mary dropped the milk, then John moved to the office. It is probably not the case that if Mary dropped the milk, and Brian is a rhino, then Julius is gray.
hypothesis: It is probably the case that sandra left the football, and Julius is gray.
valid_hypothesis: It is impossible that sandra left the football, and Julius is gray.
invalid_hypothesis: It is probably the case that sandra left the football, and Julius is gray.
hypothesis_assertion: Sandra left the football, and Julius is gray.