class Program

    {

        static void Main(string[] args)

        {

            getPairs(, , , , "");

            Console.ReadKey();

        }

        private static void getPairs(int close, int left, int right, int inter, string backet)

        {

            if (left == close && right == close)

            {

                Console.Write(backet + ", ");

            }

            if (left < close)

            {

                getPairs(close, left + , right, inter++, backet + "(");

            }

            if (right < left)

            {

                getPairs(close, left, right + , inter++, backet + ")");

            }

        }

    }