import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class ER93A {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int t = scn.nextInt();
		while (t > 0) {
			int n = scn.nextInt();
			int[] arr = scn.readArray(n);
			if (arr[0] + arr[1] < arr[n - 1]) {
				out.println(1 + " " + 2 + " " + n);
			}
			else {
				out.println(-1);
			}
			t--;
		}
		out.close();
	}

	static FastScanner scn = new FastScanner();
	static PrintWriter out = new PrintWriter(new BufferedOutputStream(System.out));

	static class FastScanner {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer("");

		String next() {
			while (!st.hasMoreTokens())
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		int[] readArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}

		long nextLong() {
			return Long.parseLong(next());
		}
	}
}
