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@@ -0,0 +1,25 @@
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+(ql:quickload :cl-who)
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+(import 'cl-who:with-html-output-to-string)
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+
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+(defun punnet (stringa stringb)
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+ (declare (string stringa stringb))
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+ (let* ((a (map 'list #'(lambda (x) (format nil "~c" x)) stringa))
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+ (b (map 'list #'(lambda (x) (format nil "~c" x)) stringb))
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+ (lena (length a))
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+ (lenb (length b)))
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+ (if (not (= lena lenb))
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+ (if (< lena lenb)
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+ (error "a < b, ~a < ~b" lena lenb)
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+ (error "a > b, ~a > ~b" lena lenb))
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+ (loop for index-b from 0 to (1- lena)
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+ collect (loop for index-a from 0 to (1- lena)
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+ collect (if (= index-b index-a)
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+ (nth index-b b)
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+ (nth index-a a)))))))
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+
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+(defun punnet-html (string-a string-b)
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+ (with-html-output-to-string (out)
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+ (:table
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+ (loop for line in (punnet string-a string-b)
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+ do (htm (:tr (loop for cell in line
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+ do (htm (:td (str cell))))))))))
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