ON bit fixed by kozima

(defun f(n k a)(if(<= 0 k n)(if(= n 0)(format t"~{~A~}
"a)(f(1- n)(f(1- n)k`(,@a 0))`(,@a 1))))(1- k))(loop(f(read)(read)/))

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

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