(c) nX3 + nX4 —› nilon-6.6 + 2nH2O, (c) nX3 + nX4 → nilon-6.6 + 2nH2O, (c) nX3 + nX4 ® nilon-6.6 + 2nH2O, (c) nX3 + nX4 ® Nilon-6.6 + 2nH2O, (c) Nx3 + Nx4 → nilon-6.6 + 2nH2O, (c) nX3 + nX4 → nilon- 6.6 + 2nH2O