t0 = Z2^2 U1 = X1*t0 t1 = Z1^2 U2 = X2*t1 t2 = Z2^3 S1 = Y1*t2 t3 = Z1^3 S2 = Y2*t3 H = U2-U1 r = S2-S1 t4 = r^2 t5 = H^3 t6 = H^2 t7 = U1*t6 t8 = 2*t7 t9 = t4-t5 X3 = t9-t8 t10 = H^2 t11 = U1*t10 t12 = t11-X3 t13 = H^3 t14 = S1*t13 t15 = r*t12 Y3 = t15-t14 t16 = Z2*H Z3 = Z1*t16