0 [709, 840, 291, 122, 511, 570, 893, 438, 897, 19]
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0 1
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1 2
1 0
2 [709, 840, 291, 122, 511, 570, 893, 438, 897, 19]
2 3
2 1
3 [709, 840, 291, 122, 511, 570, 893, 438, 897, 19]
3 4
3 2
4 [709, 840, 291, 122, 511, 570, 893, 438, 897, 19]
4 5
4 3
5 [709, 840, 291, 122, 511, 570, 893, 438, 897, 19]
5 6
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7 6
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8 9
8 7
9 [709, 840, 291, 122, 511, 570, 893, 438, 897, 19]
9 8