#include <bits/stdc++.h>
using namespace std;
int main() {
  int t, n;
  cin >> t;
  while (t--) {
    cin >> n;
    vector<int> arr(n);
    for (int i = 0; i < n; i++) cin >> arr[i];
    int found = 0;
    for (int i = 0; i < n - 2 && !found; i++) {
      int x = arr[i];
      int y = arr[i + 1];
      int z = arr[i + 2];
      if (x + y <= z) {
        cout << i + 1 << " " << i + 2 << " " << i + 3 << endl;
        found = 1;
      }
    }
    if (!found) cout << -1 << endl;
  }
  return 0;
}
