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