Eight: 11 wallclock secs ( 4.68 usr +  5.46 sys = 10.14 CPU) @ 450.69/s (n=4570)
      Four: 10 wallclock secs ( 4.79 usr +  5.21 sys = 10.00 CPU) @ 449.60/s (n=4496)
     Seven: 10 wallclock secs ( 7.28 usr +  2.84 sys = 10.12 CPU) @ 293.97/s (n=2975)
       Six: 10 wallclock secs ( 7.13 usr +  2.88 sys = 10.01 CPU) @ 293.81/s (n=2941)