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use warnings;
use strict;
...
    join ':'
      , Delta_Format("+${t}seconds",'exact','%dh','%hv','%mv','%sv');
}

%contenders = (
                'Tanktalus' => {
...
                                 'code' => sub { "DUMMY" }
                               }
              );

                Rate cw_sensible cw_silly gloryhack GrandFather   gam3
+ Tanktalus
cw_sensible  27248/s          --     -46%      -67%        -73%   -75%
+      -83%
...
GrandFather  99258/s        264%      98%       19%          --   -10%
+      -37%
gam3        110623/s        306%     121%       33%         11%     --
+      -30%
Tanktalus   157554/s        478%     214%       89%         59%    42%
+        --