Benchmark: timing 5 iterations of A, B...
         A: 24 wallclock secs (23.49 usr +  0.34 sys = 23.83 CPU) @  0.21/s (n=5)
         B: 54 wallclock secs (52.74 usr +  1.40 sys = 54.14 CPU) @  0.09/s (n=5)