import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.*;

public class badTriangle {
	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 sc = new FastReader();
		
		
		int t=sc.nextInt();
		while(t-->0)
		{
			int n=sc.nextInt();
			int a[]=new int[n];
			for(int i=0;i<n;i++)
			{
				a[i]=sc.nextInt();
			}
			
			if(a[n-1]>=a[0]+a[1])
			{
				System.out.print("1 2 "+(n));
				System.out.println();
			}
			else
			{
				System.out.println("-1");
			}
		}
	}
}