define(f,`$1ifelse($1 ,$2,,`ifelse($3,0,` f(incr($1),$2,$4,incr($4))',` f(incr($1),$2,decr($3),$4)')')')f(1,include(/dev/fd/0),0,1)
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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