import java.util.*;
import java.lang.*;
public class Main
{
	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();
		}
		long s = a[0]+a[1];
		if(a[n-1]>s) System.out.println(1+" "+2+" "+n);
		else System.out.println(-1);
	}	
	}
}
