Magnetic Board
3'x5' made by Bhaskar using a galvanized sheet. painted yellow. You can write on it with a chalk. The cost is less than Rs 500. Can be nailed to the wall.
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Fu Traing Wang and Chuan-Chih Hsiung proved in 1942 that there are only thirteen convex tangram configurations (config segment drawn between any two points on the configuration's edge always pass through the configuration's interior, i.e., configurations with no recesses in the outline
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