#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int64_t a[n];
    for (int i = 0; i < n; i++) {
      cin >> a[i];
    }
    if (n >= 3) {
      int64_t sum = a[0] + a[1], flag = 0;
      if (sum < a[n - 1]) {
        flag = 1;
        cout << 1 << " " << 2 << " " << n << endl;
      }
      if (!flag) {
        cout << -1 << endl;
      }
    } else
      cout << -1 << endl;
  }
}
