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There is a page named "File:Steiner chain 12mer.svg" on Wikipedia
DescriptionSteiner chain 12mer.svg English: Steiner chain of 12 circles (black) for two given circles (red and blue). Date 27 August 2008 Source Own work...(432 × 432 (2 KB)) - 06:03, 10 October 2020
DescriptionSteiner chain 12mer annular.svg English: Annular Steiner chain of twelve circles. Date 29 August 2008 Source Own work Author WillowW...(369 × 369 (6 KB)) - 07:49, 28 September 2020
