using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int [] nums = (2, 4, 3, 4, 6, 7, 1);

        int target = 7;

        ArrayList pairs= new ArrayList();

        for(int i=0;i<nums.Length;i++){

            for (int j=1;j<nums.Length -1;j++){

                if(nums[i] + nums[j] == target){

                    int [] pair = (nums[i],nums[j]);

                    if(pairs.IndexOf(pair) == -1)

                        pairs.Add(pair);

                }

            }

        }

        foreach(int[] pair in pairs){

            Console.WriteLine("[{0},{1}",pair[0],pair[1]);

        }

    }

}