Rectangles: (5 entries)
  0: Rectangle: x1=0, y1=0, x2=0, y2=0
  1: Rectangle: x1=121, y1=521, x2=146, y2=545
  2: Rectangle: x1=154, y1=668, x2=187, y2=701
  3: Rectangle: x1=192, y1=822, x2=232, y2=862
  4: Rectangle: x1=214, y1=933, x2=260, y2=979