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luben@karavelov:~/perl$ ./t -N=4000
4000: Took 2.062 seconds
luben@karavelov:~/perl$ ./tac -N=4000
4000: Took 2.538 seconds

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luben@karavelov:~/perl$ perl -V
Summary of my perl5 (revision 5 version 10 subversion 1) configuration
+:
...
                        USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
                        USE_PERLIO USE_REENTRANT_API
...