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

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