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C# c# permutation, 4 elements

cferenc

New Coder
Hi
my name is frank. I try to make my homework regarding app. doing permutation with 4 elements. I am using c#, array of int. It looks o but I am afraid it is not.can I get help yo sort out correctly? thank you.
my code is:
c# permutation:
using System;

namespace ConsoleApp1permutacio1
    {
        class Program
        {
            static void Main(string[] args)
            {
                int g;
                int h;
                int i;
                int j;
                int a = 0;
                int b = 0;
            int[] myNum = { 10, 20, 30, 40};
                for (g = 0; g < 4; g++)
                {
              
                for (h = 0; h < 3; h++)
                    {
                         a = myNum[h];
                         myNum[h] = myNum[h+1];
                         myNum[h+1] = a;
                    Console.WriteLine("  ");
                    for (i = 1; i < 3; i++)
                        {
                            b = myNum[i];
                            myNum[i] = myNum[i + 1];
                            myNum[i + 1] = b;
                       // Console.Write(" i " +i+ " ");
                       // Console.WriteLine(" h ");
                            for (j = 0; j < 4; j++)
                            { Console.Write("  " + j + " " + myNum[j] + " ");
                             // if (myNum[i] == myNum[j])
                             // {

                            // }
                            
                            }
                       }
                    }

                    Console.WriteLine("  ");
                }

            }
        }
    }
 
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