$rect_list = 
  [  [ [0, 0], [3, 9 ] ],
     [ [5, 4], [3, 10] ], 
     [ [7, 8], [9, 11] ]. 
     [ [2, 4], [5, 15] ], 
     [ [1, 9], [9, 13] ], 
   ];