import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main3 {

    public static void main(String[] args) throws Exception
    {
        Scanner in = new Scanner(System.in);
        
        int t = in.nextInt();


        for (int i = 0; i < t; i++) {
            int n = in.nextInt();

            int a[] = new int[n];

            for (int j = 0; j < a.length; j++) {
                a[j] = in.nextInt();

                
            }

            if (a[0] + a[1] >= a[n-1]){
                System.out.println(1 + " " + 2 +" " + n);
            }else
            {
                System.out.println(-1);
            }

        }


    }

}