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4$\begingroup$ Welcome to Puzzling.SE! Can you please provide the source of this puzzle? $\endgroup$– phenomistCommented Jun 17, 2018 at 5:43
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2$\begingroup$ (Ok, found it: 2007 Changchun Invitational World Youth Mathematics Intercity Competition Team Contest #6.) cauchy.math.nknu.edu.tw/math/country/pasttest/… $\endgroup$– phenomistCommented Jun 17, 2018 at 6:04
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