#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    vector<int> val, arr, ans;
    ans.push_back(1);
    bool done = false;
    for (int i = 0; i < n; i++) {
      int x;
      cin >> x;
      arr.push_back(x);
    }
    for (int i = 0; i < n; i++) {
      if (i == 0)
        val.push_back(arr[i]);
      else {
        if (arr[i] >= val.back() && val.size() == 1) {
          val.push_back(arr[i]);
          ans.push_back(i + 1);
        } else if (val.size() == 2 && val[0] + val[1] < arr[i]) {
          ans.push_back(i + 1);
          for (auto k : ans) cout << k << " ";
          cout << "\n";
          done = true;
          break;
        }
      }
    }
    if (!done) cout << "-1\n";
  }
  return 0;
}
