In the following test, the purple square
  should be on the left (⇦ ), and the teal square on the right (
), and the teal square on the right ( ⇨) of the blue
  rectangle.
⇨) of the blue
  rectangle.
 
     Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle.
    Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle.
    Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle.
    Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle. Blue rectangle.