Four Number Game by kaki

(do('abs(r read))(#f)(do((a(+(r)0)'(- a b))(b(r)'(- b c))(c(r)'(- c d))(d(r)'(- d a)))((if(print a" "b" "c" "d)(= a d 0))))(print))

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

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