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