#grad__grade  one-hundredth of a right angle
  supertype:  #angular_unit__angularunit  a unit of measurement for angles
  part of:  #quadrant.angular_unit__right_angle__rightangle  a quarter of the circumference of a circle
     part of:  #straight_angle  an angle of 180 degrees
        part of:  #circumference  the length of the closed curve of a circle

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