[10:27:15 jhorner@gateway scripts]$ ./ch0as-1.pl test.txt
Benchmark: timing 100 iterations of whichone, whichtwo...
  whichone:  0 wallclock secs ( 0.01 usr +  0.02 sys =  0.03 CPU) @ 3333.33/s (n=100)
            (warning: too few iterations for a reliable count)
  whichtwo: 14 wallclock secs (12.54 usr +  1.55 sys = 14.09 CPU) @  7.10/s (n=100)