a_1 a_2 a_3 a_4 a_5 b_1 b_2 b_3 b_4 c_1 c_2 c_3 c_4 d_1 d_2 d_3 d_4 d_5 d_6 d_7 d_8 e_1 e_2 e_3 e_4 f_1 f_2 f_3 f_4 f_5 f_6 g_1 g_2 g_3 g_4 g_5