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Educational Codeforces Round 20 E. Roma and Poker
Codeforces Round 903 (Div. 3) G. Anya and the Mysterious String
Codeforces Round 906 (Div. 1) C1. Doremy’s Drying Plan (Easy Version)
Codeforces Round 907 (Div. 2) F. A Growing Tree
Codeforces Round 908 (Div. 1) C. Freedom of Choice
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