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