#include <bits/stdc++.h>
const long long MOD = 1e9 + 7;
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    long long arr[n];
    for (int i = 0; i < n; ++i) cin >> arr[i];
    if (arr[0] + arr[1] <= arr[n - 1])
      cout << 1 << " " << 2 << " " << n << endl;
    else
      cout << -1 << endl;
  }
  return 0;
}
