Tangram, the seven-piece Chinese dissection puzzle, with exact geometry: fill an outline with the two large triangles, the medium triangle, the two small triangles, the square and the parallelogram, no gaps, no overlaps. The thirteen convex figures of Wang and Hsiung's 1942 theorem are re-derived by the engine, 48 figures are generated from seeds, and a lab counts every figure's solutions and tests whether a tangram solution is ever unique. An independent reimplementation of the public-domain puzzle; nothing runs on a server and nothing costs anything.

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