I'm working on my first project using Perchance to create an RPG character generator. I want to add a feature where, if a generated character's race has subraces, there's a chance for a subrace to be generated as well.

For example, if the race "Elf" is generated, I want there to be a chance that it specifies "High Elf," "Wood Elf," or "Dark Elf" as a subrace. How can I implement this functionality in Perchance?