Benchmark: timing 15000 iterations of Aristotle, Fatvamp, bobn...
 Aristotle:  3 wallclock secs ( 2.47 usr +  0.00 sys =  2.47 CPU) @ 6072.87/s (n=15000)
   Fatvamp:  3 wallclock secs ( 3.51 usr +  0.00 sys =  3.51 CPU) @ 4273.50/s (n=15000)
      bobn:  3 wallclock secs ( 2.35 usr +  0.00 sys =  2.35 CPU) @ 6382.98/s (n=15000)
            Rate   Fatvamp Aristotle      bobn
Fatvamp   4329/s        --      -29%      -33%
Aristotle 6098/s       41%        --       -5%
bobn      6452/s       49%        6%        --