context: We doubt that Mary went to the office. It is highly unlikely that Julius is yellow. It is highly unlikely that Sandra got the football.
hypothesis: It is impossible that julius is yellow, and Sandra got the football.
valid_hypothesis: It is impossible that julius is yellow, and Sandra got the football.
invalid_hypothesis: There is a better than even chance that julius is yellow, and Sandra got the football.
hypothesis_assertion: Julius is yellow, and Sandra got the football.