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

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