It’s all statistics. At a certain point, a plagurised work will have far more matching sentences, phrases, and paragraphs than non-plagurised worked. And the number doesn’t even have to be very high. The probability of an entire paragraph matching by pure coincidence is next to zero. The worst offenders will copy far more than one paragraph.
In a 3 page paper, a whole sentence might be a carbon copy and be coincidences. 10 sentences??? Better be 10 cited quotations.
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