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use strict;
use warnings;
...
    s/^\s+//;
    s/\s*$//;
}

           Rate starstar plusstar plusplus starplus   twosub
starstar 47.0/s       --      -8%     -25%     -28%     -42%
...
plusplus 62.5/s      33%      22%       --      -4%     -23%
starplus 65.1/s      39%      27%       4%       --     -20%
twosub   81.6/s      74%      59%      31%      25%       --