Region Locking

That Citrix training I was promised? Yeah, it's right there with that advancement I was also promised. And the raise. There's Citrix training to be had, but not here, nosiree. It's too expensive here in Germany. Citrix offers training all over the world, even in Bulgrohungria. Do you see where this is going? I did as soon as my manager Vera mentioned it.

Sweet poll.
x-posted to da brog.

(Forgive the 2nd post in a day)
My professor says it's possible to do a breadth first tree traversal using the "list of children" approach, but I'm only able to do it with the "next sibling, next child" approach. Could any of you Husians (including communists) assist in completing f2 below? TIA