n_m
n_n
aM_m
n_b
n_v
u_m
u_n
u_b
u_v
u_c
u_x
aM_n
u_z
u_l
aM_b
n_c
u_j
aM_c
b_m
I_R_m
I_R_n
I_R_b
m_m
u_h