X
X
X
1
1
X
1
X
X
2
2
X
X
X
X
3
3
3
3
3
3
3
3
4
4
X
4
X
X
X
X
4
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
9
10
11
11
12
13
14
15
16
17