#include <bits/stdc++.h>
using namespace std;
long long t, n, x, y, k, i, j, vt, a[1010];
int main() {
  cin >> t;
  while (t-- > 0) {
    cin >> n;
    for (i = 1; i <= n; i++) cin >> a[i];
    bool kt = 0;
    for (i = 3; i <= n; i++)
      if (a[1] + a[2] <= a[i]) {
        vt = i;
        kt = 1;
        break;
      }
    if (kt)
      cout << 1 << " " << 2 << " " << vt << endl;
    else
      cout << -1 << endl;
  }
  return 0;
}
