#include <bits/stdc++.h>
using namespace std;
inline int Int() {
  int x;
  cin >> x;
  return x;
}
inline long long Long() {
  long long x;
  cin >> x;
  return x;
}
inline float Float() {
  float x;
  cin >> x;
  return x;
}
inline double Double() {
  double x;
  cin >> x;
  return x;
}
inline void Yes() { cout << "Yes" << endl; }
inline void No() { cout << "No" << endl; }
inline void YES() { cout << "YES" << endl; }
inline void NO() { cout << "NO" << endl; }
const int N = (int)2e5 + 5;
const int maxN = (int)1e6 + 6;
const long long Mod = (long long)1e9 + 7;
const int inf = (int)2e9;
const long long Inf = (long long)1e18;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL);
  int t, q;
  cin >> t;
  for (q = 1; q <= t; q++) {
    long long n, i, x, c = 0;
    cin >> n;
    long long a[n];
    for (int i = 0; i < n; i++) cin >> a[i];
    for (i = 2; i < n; i++) {
      if (a[0] + a[1] < a[i]) {
        x = i + 1;
        c = 1;
        break;
      }
    }
    if (c)
      cout << 1 << " " << 2 << " " << x << endl;
    else
      cout << -1 << endl;
  }
  return 0;
}
