num      brute
strings  force    Robo1  Robo2
-------  -------  -----  -----
    100     .125   .125   .110
    200     .234   .172   .125
    300     .202   .141   .110
    400     .234   .156   .110
    500    1.030   .187   .125
   1000    3.916   .265   .188
   2000   15.288   .390   .265
   3000   11.435   .546   .328
   4000   15.319   .656   .422
   5000   93.600   .858   .546
  10000  377.412  1.638  1.029
  20000           3.151  1.981
  30000           4.493  2.621
  40000           5.866  3.417
  50000                  4.929