#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n, flag1 = 0, flag2 = 0;
    cin >> n;
    long long 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;
    }
  }
  return 0;
}
