N字

n
0
2
n
0
1
n
0
1
n
0
1
n
0
1
N
0
5
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1
n
0
4
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1
n
0
1