Layershttps://t.co/26bDVXp9rn
— Martin Holtham (@GHSMaths) March 30, 2018
Based on layered wooden #mathart by @vyrin: https://t.co/EHPJVzNouH pic.twitter.com/6DJixncEsi
from Twitter https://twitter.com/GuideCalculator
March 31, 2018 at 02:39PM
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