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use strict;
use warnings;
...
        $txt .= $a[$i];
    }
}

            Rate  jbrug2    duff   duff2   jbrug  graff2   graff
jbrug2    1348/s      --    -99%    -99%   -100%   -100%   -100%
...
jbrug   379315/s  28041%    276%     55%      --    -76%    -82%
graff2 1556035/s 115341%   1441%    535%    310%      --    -28%
graff  2162638/s 160344%   2041%    782%    470%     39%      --