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Benchmark: timing 20000 iterations of for, while()...
       for: 45 wallclock secs (43.95 usr +  0.00 sys = 43.95 CPU) @ 45
+5.06/s (n=20000)
   while(): 43 wallclock secs (43.28 usr +  0.00 sys = 43.28 CPU) @ 46
+2.11/s (n=20000)