context: It is almost certain that Julius is a swan. It is certain that Mary took the football. Chances are slight that Greg is a lion.
hypothesis: It is certain that mary took the football, or Julius is a swan.
valid_hypothesis: It is certain that mary took the football, or Julius is a swan.
invalid_hypothesis: It is impossible that mary took the football, or Julius is a swan.
hypothesis_assertion: Mary took the football, or Julius is a swan.