#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int t;
  cin >> t;
  for (int i = 0; i < t; i++) {
    long long int a;
    cin >> a;
    long long int arr[a];
    for (int j = 0; j < a; j++) {
      cin >> arr[j];
    }
    if (arr[a - 1] > arr[0] + arr[1]) {
      cout << 1 << " " << 2 << " " << a << "\n";
    } else {
      cout << -1 << "\n";
    }
  }
}
