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