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What is the story behind the source code at that site? It looks like letters have been randomly replaced by look-alike HTML entities, but to what end?

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would it throw off adsense, making other terms stand out?

I was thinking they were trying to fool duplicate content detection algorithms. Make it look unique and you might get higher search engine ranking.

That's exactly what they're doing, this is most likely an autoblog. Its an older content spam technique that works surprisingly well

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