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phamkien3509

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Problems solved: 7
Rank by points: #12287
Total points: 2.29
Contribution points: 0

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From Trường THPT chuyên Khoa học Tự nhiên - Đại học Quốc gia Hà Nội, Trường THPT chuyên Thủ Khoa Nghĩa, An Giang

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