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Is there a name for the “tree” aproach to listing things?

I've only been studying computer science for a few weeks, so I apologize if this is a silly or naive question. Suppose we're trying to list all elements of the set $$C(r) = \{(x,y,z) \in \mathbb{N}^3 ...
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Are there data structures that mix a tree structure with lists?

I suppose something like this could probably be easily designed, however I was wondering if there's a data structure that somehow uses both list and tree to access data. Something like this (I'll be ...