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