WOLFRAM|DEMONSTRATIONS PROJECT

Tetrads

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tetrad
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Rearrange the four given tiles so that each tile shares some boundary (of positive measure) with the other three tiles. Such an arrangement is called a "tetrad".
This game demonstrates 51 examples of tetrads with various properties, including gap-free tetrads, tetrads using symmetrical tiles, and tetrads based on polyiamonds (on a triangular grid).