"Greenspun's Tenth Rule: Any sufficiently complicated C or Fortran program contains an ad hoc informally-specified bug-ridden slow implementation of half of Common Lisp."

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Added on April 10, 2026
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Original Language: English

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Greenspun indicates on his website that he does not recall where he originally wrote this, and laments in correspondence (2003) that this quip may be all that posterity remembers of him.