#course.layer__row  a layer of masonry; "a course of bricks"
  supertype:  #layer.flat_solid  single thickness of usually some homogeneous substance
  part of:  #wall
  subtype:  #row_of_bricks  a course of bricks place next to each other (usually in a straight line)

No statement uses or specializes #course.layer; click here to add one.