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Educational Codeforces Round 78 --- F. Cards SEERC 2019 F. Game on a Tree Codeforces Round #630 -- G. No Monotone Triples Educational Codeforces Round 83 --- F. AND Segments
Educational Codeforces Round 78 --- F. Cards
SEERC 2019 F. Game on a Tree
Codeforces Round #630 -- G. No Monotone Triples
Educational Codeforces Round 83 --- F. AND Segments