(v3 x y) | (w7 x y)
(+ (+ x y) (v3 x y)) | (+ (w7 x y) (+ x y))
(v2 x y) | (v6 x y)
(+ (v2 x y) (+ x y)) | (+ (v6 x y) (+ x y))
(v1 x y) | (v5 x y)
(+ (v1 x y) (+ x y)) | (+ (v5 x y) (+ x y))
