import java.io.*;
import java.util.*;
 
public class Soln
{
    public static void main(String[] args) throws IOException
    {
        BufferedReader b = new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(b.readLine());
        while(t>0)
        {
            t--;
            int n = Integer.parseInt(b.readLine());
 
            String[] s = b.readLine().split(" ");
            if(n>2)
            {
		    int a[] = new int[n];int k=0,sum=0;
		    for (int i = 0; i < n; i++)
		    {
			a[i] = Integer.parseInt(s[i]);
		    }
            sum=a[0]+a[1];
		    for(int i=2;i<n;i++)
		    {
		    	if(sum<a[i])
		    	{
		    		k=i;break;
		    	}
		    }
		    if(k>0)
		    	System.out.println("1 2 "+(k+1));
		    else
				System.out.println(-1);
 
            }
            else{
            	System.out.println(-1);
            	}
		}
 
    }
}