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sub c{
($_,$a)=@_;s!.!chr($h{$&}||=($a=~/./g,ord$&))!ge;$_
#23456789_123456789_123456789_123456789_123456789_1
}

sub c{
($_,$a,%h)=@_;s!.!chr($h{$&}||=($a=~/./g,ord$&))!ge;$_
#23456789_123456789_123456789_123456789_123456789_1234
}