#include <bits/stdc++.h>
using namespace std;
void solve() {
  long long int n;
  cin >> n;
  long long int arr[n];
  for (long long int i = 0; i < n; i++) {
    cin >> arr[i];
  }
  if (arr[0] + arr[1] < arr[n - 1])
    cout << 1 << " " << 2 << " " << n << '\n';
  else
    cout << -1 << '\n';
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int tc = 1;
  cin >> tc;
  for (int t = 1; t <= tc; t++) {
    solve();
  }
}
