#convexity__convexness  the property possessed by a convex shape
  supertype:  contour__shape__form__configuration  any spatial attribute (especially as defined by outline); "he could barely make out their shapes through the smoke"
  subtype:  roundedness__roundednes__bulgines  the property possessed by a rounded convexity
     subtype:  oblateness__ellipticity  the property possessed by a rounded shape that is flattened at the poles; "the oblateness of the planet"

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