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#!/usr/bin/perl
use strict;
use warnings;
...
chr$_}=p for 32..126;sub r{$;=1+int log(1+keys%d)/log(2);$_="0"x($;-le
+ngth).
$_ for values%d;%r=reverse%d;s/(.{$;})//?$1:0}$a=$^=$r{r()};while($"=r
+){$^=~
/(.)/;$.=exists$r{$"}?$r{$"}:$^.$1;$a.=$.;$.=~/(.)/;$d{$^.$1}=p;$^=$.}
+eval$a