import java.util.*;
import java.lang.*;
import java.io.*;
public class Task {
	public static void main (String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine().trim());
		while(t-- > 0) {
		    int n = Integer.parseInt(br.readLine().trim());
		    int sum = 0, cnt = 0;
		    int a[] = new int[n];
		    String ch[] = br.readLine().trim().split(" ");
		    for(int i = 0; i < n; i++)
		        a[i] = Integer.parseInt(ch[i]);
		        
		    if(n < 3) {
		        System.out.println("-1");
		        continue;
		    }
		   if(a[0] + a[1] < a[n - 1]) {
		       System.out.println(1+" "+2+" "+n);
		       continue;
		   } else 
		        System.out.println("-1");
		}
	}
}