#grade  the gradient of a slope or road or other surface: "the road had a steep grade"
  supertype:  #slope__grade  the property possessed by a line or surface that departs from the horizontal; "a five-degree grade"
  subtype:  #upgrade__rising_slope  the property possessed by a slope or surface that rises
  subtype:  #downgrade  the property possessed by a slope or surface that descends

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