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# input length: 7
          Rate ?<!Y  ?!X ?<!X  ?!Y
...
?!X   908420/s  48%   -- -27% -29%
?<!X 1236528/s 102%  36%   --  -4%
?!Y  1286220/s 110%  42%   4%   --

use strict;
use warnings;
...
           }
        );
__END__