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#! perl -sw
use 5.010;
...
C:\test>767001.pl 767001-small.dat
2779316821
Took: 3.148000 seconds

#! perl -sw
use 5.010;
...
2779316821
Took: 1.804000 seconds

#! perl -sw
use 5.010;
...
Took: 0.014622 seconds