Sometimes, it is impossible to prevent duplicate content from appearing on a website or on different (country) domains. There can be various reasons for this: starting with URL parameters, session IDs and printer friendly pages to the necessity to provide identical content on .co.uk and .com.
Keyword density, WDF*IDF analysis or just a clear and simple writing style for readers? We certainly are not talking about rocket science here. But it does help to employ a few fundamental tricks. Go here to see for yourself!
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