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Educational Codeforces Round 139 (Rated for Div. 2)
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Educational Codeforces Round 128 (Rated for Div. 2)
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Codeforces Round #791 (Div. 2)
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Educational Codeforces Round 127 (Rated for Div. 2)
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Codeforces Round #782 (Div. 2)
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Educational Codeforces Round 126 (Rated for Div. 2)
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Codeforces Round #781 (Div. 2)
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Codeforces Round #779 (Div. 2)
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Educational Codeforces Round 125
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Codeforces Round #778 (Div. 1 + Div. 2)(不全)
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Codeforces Round #777 (Div. 2)
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Codeforces Round #775 (Div. 1)(不全)
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Codeforces Round #737 (Div. 2)