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