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Product Description
<p><span style="font-size:medium">Here is a popular fractal, often called the </span><span style="font-size:16px">Sierpinski Cube or Menger Sponge.</span><span style="font-size:medium"> It is a three-dimensional generalization of the two-dimensional Sierpinski square. This is a "fourth-order" version, as there are four different sizes of holes.</span></p>
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