context: It is unlikely that Sandra got the football. It is certain that Fred left the football. Chances are about even that Mary went to the office.
hypothesis: It is certain that sandra got the football, or Fred left the football.
valid_hypothesis: It is certain that sandra got the football, or Fred left the football.
invalid_hypothesis: It is highly unlikely that sandra got the football, or Fred left the football.
hypothesis_assertion: Sandra got the football, or Fred left the football.