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