#include <bits/stdc++.h>
using namespace std;
int v[500005];
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  long long n, m, d, i, j, t;
  cin >> t;
  while (t--) {
    cin >> n;
    for (i = 1; i <= n; ++i) cin >> v[i];
    if (v[1] + v[2] > v[n])
      cout << -1 << '\n';
    else
      cout << "1 2 " << n << '\n';
  }
  return 0;
}
