tilly gives: 1600
chetlin gives: 1600
Benchmark: running chetlin, tilly, each for at least 5 CPU seconds...
   chetlin:  9 wallclock secs ( 5.52 usr +  0.00 sys =  5.52 CPU) @ 333.70/s (n=1842)
     tilly: 10 wallclock secs ( 5.09 usr +  0.00 sys =  5.09 CPU) @ 104.52/s (n=532)