import java.util.*;

public class A {
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      int t = sc.nextInt();
      while (t-->0) {
         int n = sc.nextInt();
         int[] arr = new int[n];
         for (int i = 0; i < n; ++i) arr[i] = sc.nextInt();
         if (arr[0] + arr[1] <= arr[n-1]) System.out.println(1 + " " + 2 + " " + (n));
         else System.out.println(-1);
      }
   }
}