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