
import java.util.Scanner;
public class Mathdemo {
    public static void main(String[] args) {
         long a,i,b,t,n,j,c = 0;
        Scanner input = new Scanner(System.in); 
        t=input.nextInt();
        while(t-->0){
         n=input.nextInt();
         a=input.nextInt();
         b=input.nextInt();
         for(j=3;j<=n;j++){
            c=input.nextInt();}
                if(a+b<=c){
                    System.out.println("1 2"+" "+n);
                }
           else{
                    System.out.println("-1");
                }
         
        
        }
    }
    
}
     
   
           
     
           

    
