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C:\test>primes-a 2
        3
...
224284387

Took: 0.000416040420532227 seconds

C:\test>dir data\primes.all
2006-02-04  15:50       165,000,000 primes.all

#! perl -slw
use strict;
...

print "Took: ", time() - $start, ' seconds';;