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2
3
8
9
11?12?
12?
c?
a.?
b?
c.
1/ 2//?/
3/? 4//?/?/
5?//? 6?/?
7?/? 8?/?/?
1
2?
3?
4?
5
1 2
3 4
5? 6
7?
9 10
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1?
1 5?
2? 6?
3 7
4 8?