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• 13:11, 31 May 2018 Drorbn talk contribs deleted page Notes for AKT-140127/0:49:12 (content before blanking was: "In the picture there are <math>1+(n-2)</math> double points. It is not clear why we get <math>n</math> double after flipping a crossing. Oh Okay, I understand it now. Hmm I thought I understood it; now I am confused.")