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At present, there are many websites for duplicate checking of free papers on the market, including the first free paper, a certain number of free words and a free paper every day. Relatively safe and reliable free duplicate checking systems include free duplicate checking websites on the market, such as the first free paper, a certain number of free words and a free paper every day. The relatively safe and reliable free duplicate checking system is paperless. Papertime, paperday, etc. To be on the safe side, it is recommended to use the duplicate checking system required by schools or academic journals!