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• 00:37, 19 September 2024 Yingkai 0 (talk | contribs) uploaded File:2017AMC12aP17-p2.png (second argand diagram for AMC12A 2017 problem 17)
• 00:32, 19 September 2024 Yingkai 0 (talk | contribs) uploaded File:2017AMC12aP17.png (Roots of unity graphic)
• 14:09, 5 January 2022 User account Yingkai 0 (talk | contribs) was created automatically