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Hey @katyhuff,

This is also built on #5. I've added a decent amount of content and made some comments based on both your comments and content. Let's iterate on this PR as you see fit; I'm happy to change the language as needed.
Do we want to mention that this hierarchy can have arbitrary levels (e.g. no nesting to nesting arbitrarily deep)?  I've run tens of thousands of simulations without any regions.