Com numeração especial:
43
1_2, 3_4, 5_6, 7_8, 9_10, 11_12, 13_14, 15_16, 17_18, 19_20, 21_22, 23_24, 25_26, 27_28, 29_30, 31_32, 33_34, 35_36, 37_38, 39_40, 41_42, 43_44, 45_46, 47_48, 49_50, 51_52, 53_54, 55_56, 57_58, 59_60, A_B, C_D, E_F, G_H, I_J, K_L, M_N, O_P, Q_R, S_T, U_V, W_X, Y_Z