
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.Vector;
/* Name of the class has to be "Main" only if the class is public. */
public class Codechef
{
	//	Template For Fast i/o copied From Gfg
	static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    }
	public static void main(String[] args)
	{
		FastReader obj=new FastReader();
		
		int t=obj.nextInt();
		while(t-->0)
		{
			ArrayList<Integer> list=new ArrayList<>();
			int n=obj.nextInt();
			ArrayList<Long> a=new ArrayList<>();
			for(int i=0;i<n;i++)
			{
				a.add(obj.nextLong());
			}
			boolean flag=true;
			int k=-1;
			long val=a.get(0)+a.get(1);
			for(int i=n-1;i>=2;i--)
			{
				if(a.get(i)>val)
				{
					flag=false;
					k=i;
					break;
				}
			}
			if(!flag)
			{
				System.out.println("1 "+"2 "+(k+1));
			}
			else
			{
				System.out.println("-1");
			}
			
		}
	}
}
//Code- aditya7409