$ perl demo2.pl haukex 2
Found at 999999
Found at 1000000
Found at 999999
Found at 1000000
duration (haukex):  0.665 seconds

$ perl demo2.pl karlary 2
Found at 999999
Found at 1000000
Found at 999999
Found at 1000000
duration (karlary): 0.477 seconds

$ perl demo2.pl karlseq 2
Found at 999999
Found at 1000000
Found at 999999
Found at 1000000
duration (karlseq): 0.253 seconds