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Rolling on the outside

Author:
Malin Christersson
Blue (n+1)-hypocycloids rolling on the outside of yellow n-hypocycloids. Red (n+1)-epicycloids rolling on the outside of gray n-epicycloids. The cusps of the (n+1)-hypocycloids, and the cusps of the (n+1)-epicycloids, lie on the curve of the n-epicycloids.

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