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- (defparameter *code* "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
- (defun encode (n) (aref *code* n))
- (defun decode (c) (position c *code*))
- (assert (= 3 (decode (encode 3))))
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