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

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