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3
6
2a
b
3
4 a
5
6 a
8 a
9
10 b
1
2 a
b
3 a
b
4 b
6
8
1 a
b
2 a
3 b
1 a
2 a
1 a
2 a
6
7 a
1b
c
2
3
6 b
7 a
2
3 a
5
b
7 a
8 a
c
9 b
3
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