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print $/;

[keszler@tek perl]# cat test3.pl
#!/usr/bin/perl -w
...
Benchmark: timing 10000 iterations of a2, b2...
        a2: 54 wallclock secs (34.37 usr +  0.93 sys = 35.30 CPU) @ 28
+3.29/s (n=10000)
        b2: 54 wallclock secs (33.69 usr +  0.90 sys = 34.59 CPU) @ 28
+9.10/s (n=10000)