|Do you know where your variables are?|
That looks suspiciously like a close variation on choroba's attempt.
Had no time to check all the other posted solutions and don't wanna reinvent the wheel,
All the tested solutions, along with how they faired in my test harness, are nicely grouped together in Re: Finding repeat sequences. (Results:Part 1).
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.