Set symmetric difference by kozima

(format t"~(~{~A ~}~)"(sort(union(#1=set-difference(setf a #2=(read-from-string(format()"(~A)"(read-line)))b #2#)a)(#1#a b))'string<))

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

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