5 +-------------------------------------------------------------------------------------------+   
    |                 +                  +        *        +        *         +                 |   
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  4 |-+                                           ###################                         +-|   
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  3 |-+                         ******************#                 #                         +-|   
    |                           *                 #                 #                           |   
    |                           *                 #                 #                           |   
    |                           *                 #                 #                           |   
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  2 |-+      *******************###################                 #*******************      +-|   
    |        *                  #                 #                 #                  *        |   
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  1 |-+      ####################                 #                 ####################      +-|   
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    |        #        +         #        +        #        +        #         +        #        |   
  0 +-------------------------------------------------------------------------------------------+   
                     aaa                bbb               ccc                ddd