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# before.pl
use strict;
...
           }
        );
__END__

% perl before.pl 7
# input length: 7
...
?!Y  2434774/s   1%   --  -3% -18%
?<!Y 2506841/s   4%   3%   -- -16%
?!X  2970871/s  23%  22%  19%   --