context: We doubt that Julius is a frog. It is certain that Greg is a swan. It is probable that Sandra left the football.
hypothesis: It is likely that sandra left the football, and Greg is a swan.
valid_hypothesis: It is likely that sandra left the football, and Greg is a swan.
invalid_hypothesis: We doubt that sandra left the football, and Greg is a swan.
hypothesis_assertion: Sandra left the football, and Greg is a swan.