#ridge.convex_shape  any long raised strip
  supertype:  #convex_shape__convexity  a shape that curves or bulges outward
  subtype:  #raphe__rhaphe  a ridge that forms a seam between two parts
     subtype:  #palatine_raphe  the seam at the middle of the hard palate
  subtype:  #corrugation  a ridge on a corrugated surface

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