#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  while (n--) {
    int t, xi = 0, xj = 0, xk = 0, flag = 0;
    cin >> t;
    int a[t];
    for (int i = 0; i < t; i++) cin >> a[i];
    for (int i = 2; i < t; i++) {
      if (a[0] + a[1] < a[i]) {
        xi = 1;
        xj = 2;
        xk = i + 1;
        cout << xi << " " << xj << " " << xk << endl;
        flag = 1;
        break;
      }
    }
    if (!flag) cout << -1 << endl;
  }
}
