C:\test>unionIntersect.pl -N=1e6 -MAX=27
       s/iter barvin    roy    buk   buk2
barvin   8.58     --   -43%   -58%   -64%
roy      4.86    77%     --   -26%   -37%
buk      3.59   139%    35%     --   -15%
buk2     3.05   182%    60%    18%     --