#coordinate_axis  one of the fixed reference lines of a coordinate system
  supertype:  #axis  a straight line through a body or figure that satisfies certain conditions
  subtype:  #x-axis  #y-axis  #z-axis
  part of:  #coordinate_system__frame_of_reference__reference_system__referencesystem__reference_frame__referenceframe  a system that uses coordinates to establish position

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