N
M
S
N
N
N
S
S
M
M
N
S
M
M
M
N
S
S
M
S
M
M
N
N
S
S
M
M
M
M
S
S
M
M
M
M
N
S
M
S
M
S
S
M
M
S
M
N
M
N