User talk:2A02:2F08:1FF:FFFF:0:0:6469:71CF

July 2020
Please do not add or change content, as you did at List of metro systems, without citing a reliable source. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. Nguyen QuocTrung (talk) 12:50, 17 July 2020 (UTC)
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