(v2 x y) | (w5 x y)
(+ (+ x y) (v2 x y)) | (+ (w5 x y) (+ x y))
(+ (+ (v1 x y) x) x) | (+ (+ (v4 x y) x) x)
(+ (v1 x y) x) | (+ (v4 x y) x)
(v1 x y) | (v4 x y)
