context: We believe that Fred is in the school. Chances are slight that Greg is gray. It is probable that Brian is a lion. It is improbable that if Fred is in the school, and Brian is a lion, then Jason is bored. It is probable that if Brian is a lion, or Greg is gray, then Sandra left the football. It is probably not the case that if Greg is gray, and Fred is in the school, then Mary picked up the milk.
hypothesis: There is almost no chance that sandra left the football, or Brian is a lion.
valid_hypothesis: It is likely that sandra left the football, or Brian is a lion.
invalid_hypothesis: There is almost no chance that sandra left the football, or Brian is a lion.
hypothesis_assertion: Sandra left the football, or Brian is a lion.