Rate replace    keep     two
replace 4739/s      --    -15%    -26%
keep    5587/s     18%      --    -13%
two     6386/s     35%     14%      --
Replace: one two  four
two  four five
one three five
Keep: one two four
two four five
one three five
Two: one two  four
two  four five
one three five