#cycloid  a line generated by a point on a circle rolling along a straight line
  supertype:  #line_roulette__roulette  a line generated by a point on one figure rolling around a second figure
  subtype:  #curate_cycloid  a cycloid generated by a point inside the rolling circle
  subtype:  #prolate_cycloid  a cycloid generated by a point outside the rolling circle

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