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