import java.util.Arrays;
import java.util.Scanner;
import java.lang.Math;


public class codeforces {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int test=sc.nextInt();
        while(test-->0){
            int n=sc.nextInt();
            int arr[]=new int[n];
            for(int i=0;i<n;i++){
                arr[i]=sc.nextInt();
            }
            if(arr[0]+arr[1]<=arr[n-1]){
                System.out.println(1+" "+2+" "+(n));
            }
            else{
                System.out.println(-1);
            }

            
        }
        
        
            

        
    }
    
}
