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==Prehistory==
{{Expand section|date=January 2011}}
The development of Scheme was heavily influenced by two predecessors that were quite different from one another: [[Lisp (programming language)|Lisp]] provided its general semantics and syntax, and [[ALGOL]] provided its [[scope (programming)|lexical scope]] and block structure. Scheme is a dialect of Lisp but Lisp has evolved; the Lisp dialects from which Scheme evolved—although they were in the mainstream at the
===Lisp===
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