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As you speak russian, take a look at the problems of Турниры Городов (Tournaments of cities.). I do believe that you can find the most interesting collection of such problems. There is a real tradition for such kind of problems and puzzles in Russia.

As you speak Russian, take a look at the problems of Турниры Городов (Tournaments of cities.). I do believe that you can find the most interesting collection of such problems. There is a real tradition for such kind of problems and puzzles in Russia.

As you speak russian, take a look at the problems of Турниры Городов (Tournaments of cities.). I do believe that you can find the most interesting collection of such problem. There is a real tradition for such kind of problems in Russia.

As you speak russian, take a look at the problems of Турниры Городов (Tournaments of cities.). I do believe that you can find the most interesting collection of such problems. There is a real tradition for such kind of problems and puzzles in Russia.

As you speak russian, take a look the problems of Турниры Городов (Tournaments of cities.). I do believe that you can find the most interesting collection of such problem. There is a real tradition for such kind of problems in Russia.

As you speak russian, take a look at the problems of Турниры Городов (Tournaments of cities.). I do believe that you can find the most interesting collection of such problem. There is a real tradition for such kind of problems in Russia.