using System;

public class Program

{

    public static void Main()

    {

        int arraySize = 12;

        Console.WriteLine("index\tprevious");

        for(int index=1; index<=arraySize; index++)

        {

            var prev = ((index - 1 - arraySize) % arraySize) + arraySize;

            Console.WriteLine(index + "\t\t"+prev);

        }

    }

}