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