Premise: Two people , one in gray and one in white , sitting on a bench by a walking path looking over a field at a forest during autumn .
Correct statement: It is impossible that the person in the red and the person in green , are briskly walking by the bench on the pier , on a rainy winter day .
Incorrect statement: It is certain that the person in the red and the person in green , are briskly walking by the bench on the pier , on a rainy winter day .