#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    long long int n;
    cin >> n;
    int p = 0;
    vector<int> v(n);
    for (int i = 0; i < n; i++) cin >> v[i];
    if (n > 3) {
      for (int i = 0; i + 2 < n; i++) {
        if (v[i] + v[i + 1] <= v[n - 1]) {
          cout << i + 1 << " " << i + 2 << " " << n << "\n";
          p = 1;
          break;
        }
      }
    } else if (n == 3) {
      if (v[0] + v[1] <= v[2]) {
        cout << "1 2 3" << endl;
        p = 1;
        break;
      }
    }
    if (p == 0) cout << -1 << "\n";
  }
}
