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use strict;
use warnings;
...
       noDups   => $rcNoDups,
       withDups => $rcWithDups,
   } );

String: xxxxfredxfredxxxxxxxfredfredxxxfredxxxxxfredxxxxxx

...
withDups 2321/s       --      -3%     -33%
noDups   2394/s       3%       --     -31%
movePos  3445/s      48%      44%       --