Data update
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(defun ar2ro (AN)
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"Translate from arabic number AN to roman number.
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For example, (ar2ro 1666) returns (M D C L X V I)."
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(cond
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((>= AN 1000) (cons 'M (ar2ro (- AN 1000))))
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((>= AN 900) (cons 'C (cons 'M (ar2ro (- AN 900)))))
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((>= AN 500) (cons 'D (ar2ro (- AN 500))))
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((>= AN 400) (cons 'C (cons 'D (ar2ro (- AN 400)))))
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((>= AN 100) (cons 'C (ar2ro (- AN 100))))
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((>= AN 90) (cons 'X (cons 'C (ar2ro (- AN 90)))))
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((>= AN 50) (cons 'L (ar2ro (- AN 50))))
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((>= AN 40) (cons 'X (cons 'L (ar2ro (- AN 40)))))
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((>= AN 10) (cons 'X (ar2ro (- AN 10))))
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((>= AN 5) (cons 'V (ar2ro (- AN 5))))
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((>= AN 4) (cons 'I (cons 'V (ar2ro (- AN 4)))))
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((>= AN 1) (cons 'I (ar2ro (- AN 1))))
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((= AN 0) nil)))
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