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- CodeForces 387E George and Cards
- CodeForces 134C Swaps
- CodeForces 272E Dima and Horses
- CodeForces 916D Jamie and To-do List
- CodeForces 71D Solitaire
- CodeForces 144E Competition
- CodeForces 427D Match & Catch
- CodeForces 125D Two progressions
- CodeForces 183C Cyclic Coloring
- CodeForces 1618G Trader Problem
- CodeForces 723E One-Way Reform
- CodeForces 550E Brackets in Implications