context: It is probably the case that Sandra grabbed the apple. We doubt that Greg is a lion. It is impossible that John took the football.
hypothesis: It is unlikely that either John took the football, or Greg is a lion.
valid_hypothesis: It is unlikely that either John took the football, or Greg is a lion.
invalid_hypothesis: There is a very good chance that either John took the football, or Greg is a lion.
hypothesis_assertion: Either John took the football, or Greg is a lion.