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