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so, just like a real tree, the single node at the very top of the tree is called the "root" these lines radiating away from it — downwards, like roots — are the "branches". Distance from the root is called "depth" the deepest nodes, obviously, are the "leaves"
we say this node here is the "parent" of these other ones. Because it's actually a family tree! that's why the nodes all have exactly one parent
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