2y 2 2x 2 July 8, 2019 16 32 64 128 2x 2y 2z 2 2x 2y 2xy 2 4xy 2x 2y 2xy 2 X 2y 2 2x y 2 0 3x 2y 2 2x y 2 X 2y 2 2x 2y 2 2x 2 2y 2 x 0 2x 2 2y 2 1 2x 2 2y 2 0 2x 2 2y 2 3 2x 2 2y 2 z 2x 2 5xy 2y 2 0 X 2y 2 2x y 2 3x 2y 2 2x 3y 2