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surplusa

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Accepted problems：18 problems

7912 8870 9535 9536 9541 9543 9733 14450 14452 14456 14459 14686 14687 14692 14721 14731 15307 15313

Tried problems：10 problems

5153 6422 6613 6621 6624 14553 14689 14719 14847 15302

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