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use warnings;
use strict;
...
    substrm => q( Substrm 'def', 'abc' ),
    substm  => q( substm  'def', 'abc' ),
};

             Rate   subst  substm  precat  substr substrm precatm
subst   2104367/s      --    -10%    -29%    -48%    -61%    -72%
...
substr  4071762/s     93%     74%     37%      --    -25%    -46%
substrm 5397081/s    156%    131%     82%     33%      --    -29%
precatm 7561845/s    259%    223%    155%     86%     40%      --