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1
x  7
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0
x  3
3
4
x  0
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1
x  5
5
1
x  6
6
2
x  1
7
3
x  1
8
8
x  0
9
1
x  0
10
2
x  0
11
0
x  5
12
1
x  4
13
9
x  1
14
0
x  6
15
0
x  7
16
8
x  1
17
0
x  9
18
1
x  1

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