#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long t;
  cin >> t;
  while (t--) {
    long long n, i;
    cin >> n;
    long long a[n];
    for (i = 0; i < n; i++) cin >> a[i];
    long long flag = 0;
    if (a[0] + a[1] <= a[n - 1])
      cout << 1 << " " << 2 << " " << 3 << endl;
    else
      cout << -1 << endl;
  }
}
