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7.
←
5
←
8.
←
6
10.
11.
←
7
12.
13.
1.
←
8
a
2.
a
a
1.
←
9
2.
←
9
1.
←
10
2.
3.
4.
←
11
5.
←
11
6.
1.
←
12
2.
←
13
1.
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