Dave is blue. Dave is cold. Dave is quiet. Dave is rough. Dave is round. Dave is not white. Dave is young. All white people are blue. If someone is not young then they are white. If someone is quiet and not young then they are cold. If someone is white and blue then they are rough. If someone is not quiet and not cold then they are not white. If someone is cold and not blue then they are white. If someone is not blue and not young then they are round. If someone is not rough then they are not cold.
Dave is young.