// Working program with FastReader 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.util.*; 
import java.util.StringTokenizer; 
  
public class Main 
{ 
    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) throws java.lang.Exception
	{
		// your code goes here
         FastReader in=new FastReader();
	     int test = in.nextInt();
	    for(int ii = 1; ii <= test; ii++)
	{
	        int n = in.nextInt();
	        int[] arr = new int[n] ; 
	        for(int i=0;i<n;i++)
	        {
	            arr[i] = in.nextInt();
	        }
	        if(arr[0]+arr[1]<arr[n-1])
	        {
	            System.out.println("1 "+"2 "+(n));
	        }else
	        System.out.println("-1");
	}
    }
}