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