#include <bits/stdc++.h>
const int INF = INT_MAX;
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int t;
  cin >> t;
  while (t--) {
    long long n;
    cin >> n;
    std::vector<long long int> v(n);
    for (int i = 0; i < n; i++) {
      cin >> v[i];
    }
    if (v[0] + v[1] < v[n - 1]) {
      cout << "1 "
           << "2 " << n << endl;
    } else {
      cout << "-1" << endl;
    }
  }
}
