#include <bits/stdc++.h>
using namespace std;
void err(istream_iterator<string> it) {}
template <typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
  cout << *it << " = " << a << "\n";
  err(++it, args...);
}
const long long MOD = 1e9 + 7, N = 1e5 + 5, inf = 1e18;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  ;
  long long t;
  cin >> t;
  while (t--) {
    long long n;
    cin >> n;
    long long a[n];
    for (int i = 0; i < n; i++) cin >> a[i];
    ;
    bool red = false;
    long long x, y, z;
    for (int i = 0; i < n - 2; i++) {
      if ((a[i] + a[i + 1]) < a[n - 1]) {
        red = true;
        x = i + 1;
        y = i + 1 + 1;
        z = n;
        break;
      }
    }
    if (red) {
      cout << x << " " << y << " " << z << "\n";
    } else
      cout << -1 << "\n";
  }
}
