Six: 10 wallclock secs ( 4.82 usr +  5.18 sys = 10.00 CPU) @ 437.30/s (n=4373)
       One: 13 wallclock secs (12.92 usr +  0.01 sys = 12.93 CPU) @  4.87/s (n=63)
      Five: 13 wallclock secs (13.39 usr +  0.00 sys = 13.39 CPU) @  5.15/s (n=69)
      Four: 10 wallclock secs ( 4.74 usr +  5.56 sys = 10.30 CPU) @ 443.69/s (n=4570)