en.wikipedia.org/wiki/Help:Find_sources

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Page Duplicate Content Search title or URL  
  URL Title Match Words ▴ Match Percentage
wiki/Help:References_and_page_numbers Help:References and page numbers - ... 622 31%
wiki/Wikipedia:Reference_desk Wikipedia:Reference desk - Wikipedia 548 27%
wiki/Wikipedia:List_of_policies_and_... Wikipedia:List of policies and ... 209 10%