import java.util.*;
public class BadTriangle {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc= new Scanner(System.in);
		int t=sc.nextInt();
		while(t-->0)
		{
			int c=0,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);
		}
	}

}
