C:\test>1064178-b.pl
                 Rate listCompare OPdiff hash_grep OPdiffModified OPdiff_undef using_vec
listCompare    12.9/s          --   -86%      -93%           -94%         -94%      -95%
OPdiff         95.1/s        639%     --      -48%           -52%         -53%      -65%
hash_grep       185/s       1334%    94%        --            -8%          -9%      -32%
OPdiffModified  200/s       1452%   110%        8%             --          -2%      -27%
OPdiff_undef    203/s       1478%   114%       10%             2%           --      -26%
using_vec       273/s       2019%   187%       48%            37%          34%        --