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1
x6
x2
21
x4
1
x1
x1
x1
x2
x2
3
x2
x6
x4
2
x1
x1
x1
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x2
x1
x2
1
2
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2
4
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x4
x2
x2
x1
5
x4
x1
x1
x1
x1
x1
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6
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x1
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7
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x1
x1
x1
x1
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3
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8
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x1
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10
x3
9
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4 6 8
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8
6
4
12
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x2
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13 1211
11
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x2
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5
14
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13 14 1516
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x1
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15
x1
x1
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x1
x1
14
15
6
18
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17
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x2 x2
7
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20
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x1
x1
x1
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21x2
x2
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19
x1
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8
20 2122
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x1
x3
x4
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24 x4
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23
9
23 2425
x2
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