Numbering by youz

(defun f'a(dotimes`3(or(format(> .'0)"~{   ~*~}~{~A~^.~}
"a #1=`(,@a,(+ .`1)))(f(- .'1)#1#))))(f(read)/)

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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