#include <bits/stdc++.h>
using namespace std;
int main() {
  long long t;
  cin >> t;
  while (t--) {
    long long n;
    cin >> n;
    vector<long long> arr(n);
    for (long long i = 0; i < n; i++) {
      cin >> arr[i];
    }
    vector<long long> ans;
    bool found = false;
    for (long long i = 0; i < n - 2; i++) {
      if (arr[i] + arr[i + 1] < arr[i + 2]) {
        ans.push_back(i);
        ans.push_back(i + 1);
        ans.push_back(i + 2);
        found = true;
        break;
      }
    }
    if (found) {
      for (long long iu : ans) cout << iu + 1 << " ";
    } else {
      cout << "-1" << endl;
      continue;
    }
    cout << endl;
  }
}
