C:\Daten\perl>benchmark.pl
Benchmark: timing 100 iterations of A, A2, C, D...
         A: 307 wallclock secs (272.94 usr + 27.55 sys = 300.49 CPU) @  0.33/s (n=100)
        A2: 316 wallclock secs (278.64 usr + 24.92 sys = 303.56 CPU) @  0.33/s (n=100)
         C: 333 wallclock secs (278.80 usr + 23.83 sys = 302.63 CPU) @  0.33/s (n=100)
         D:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)