code: def points_from_y0x0y1x1(yxyx):
      
      y0 = yxyx[0]
      x0 = yxyx[1]
      y1 = yxyx[2]
      x1 = yxyx[3]
      return "%s,%s %s,%s %s,%s %s,%s" % (
          x0, y0,
          x1, y0,
          x1, y1,
          x0, y1
      )
docs: Constructs a polygon representation from a rectangle described as a list [y0, x0, y1, x1]