context: It is impossible that Sandra got the football. Chances are slight that Julius is a swan. It is certain that Brian is a frog.
hypothesis: It is impossible that sandra got the football, or Brian is a frog.
valid_hypothesis: It is certain that sandra got the football, or Brian is a frog.
invalid_hypothesis: It is impossible that sandra got the football, or Brian is a frog.
hypothesis_assertion: Sandra got the football, or Brian is a frog.