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Lisp初心者は、まず「グリーンスパンの第10法則」を知っておきましょう。

Greenspun's Tenth Rule of Programming
http://www.practical-scheme.net/wiliki/wiliki.cgi/Lisp:GreenspunsTenthRule

"Any sufficiently complicated C or Fortran program contains
an ad-hoc, informally-specified bug-ridden slow implementation
of half of Common Lisp."