number slide by 51b

define(f,`$3ifelse($3
,$4,`m4exit',$1,0,`
f($2,incr($2)',` f(decr($1),$2'),incr($3),$4)')f(0,1,1,include(/dev/fd/0))

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

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