import java.util.*;
import java.io.*;
 
public class A {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		while(t-->0) {
			int n = sc.nextInt();
			int[] a = new int[n];
			for(int i = 0; i < n; i++) {
				a[i] = sc.nextInt();
			}
			if(a[0] + a[1] <= a[n-1]) {
				System.out.println(1 + " " + 2 + " " + (n));
			} else {
				System.out.println(-1);
			}
		}
	}
}