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Leaf node

In computer science, a leaf node is a node of a tree data structure that has zero child nodes. Often, leaf nodes are the nodes farthest from the root node. Some trees only store data in leaf nodes.

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List of closed London Underground stations

... Marlborough Road tube station[?] North End tube station[?] (aka Bull & Bush; never opened) North Weald tube station[?] Ongar tube station[?] St Mary's (Whitechapel ...