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well i actually asked my tutor this very question and he said there is no such website, what they look for is chunks of text that appear to have been copied from books or off the comp, they can apparently tell when the style of writing changes within your essay they can even tell it was written by you from the language used (accent) as my tutor very kindly told me i had written in a northern twang and to stop doing it, think about it logically how could a website decide if you had written it yourself it would have to have every book and every essay anyone had written to have a comparison, so don't worry but try to write it your own way.
One such website can be found at this link:
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