# input length: 7
          Rate ?<!Y  ?!X ?<!X  ?!Y
?<!Y  613304/s   -- -32% -50% -52%
?!X   908420/s  48%   -- -27% -29%
?<!X 1236528/s 102%  36%   --  -4%
?!Y  1286220/s 110%  42%   4%   --