ANSI Common Lisp 14 Conses 14.1 Cons Concepts
14.1.1 Conses as TreesA tree is a binary recursive data structure made up of conses and atoms: the conses are themselves also trees (sometimes called "subtrees" or "branches"), and the atoms are terminal nodes (sometimes called leaves). Typically, the leaves represent data while the branches establish some relationship among that data.
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