import java.util.*;
public class HelloWorld{

     public static void main(String []args){
        //System.out.println("Hello World");
        
        Scanner in  = new Scanner (System.in) ;
        int t = in.nextInt() ;
        
        while(t-->0){
            
            int n = in.nextInt();
            
            long a[] = new long[n];
            for(int i=0;i<n;i++)a[i] = in.nextLong();
            if(a[0]+a[1] <a[n-1]){
                System.out.println(1+" "+2+" "+n);
            }
            else {
                System.out.println(-1);
            }
            
        }
     }
}