#include <bits/stdc++.h>
using namespace std;
const int INF = 1000000001;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long t, n, i, j, k, m, x, y, sum = 0;
  cin >> t;
  while (t--) {
    cin >> n;
    long long arr[n];
    for (i = 0; i < n; i++) {
      cin >> arr[i];
    }
    if (arr[0] + arr[1] < arr[n - 1]) {
      cout << 1 << " " << 2 << " " << n << '\n';
    } else {
      cout << "-1" << '\n';
    }
  }
}
