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