#include <bits/stdc++.h>
using namespace std;
const int N = 100010;
int n, arr[N];
int main() {
  int t;
  cin >> t;
  while (t--) {
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
      scanf("%d", &arr[i]);
    }
    if (arr[0] + arr[1] <= arr[n - 1]) {
      cout << 1 << " " << 2 << " " << n << endl;
    } else
      cout << -1 << endl;
  }
  return 0;
}
