-----0-----                      
|    |    |                      
9-   |    |                      
 |   |    |                      
 -6--|    |                      
  | ||    |                      
  8-||    |                      
   |||    |                      
   7-|    |                      
     |    |                      
     5-   |                      
      |   |                      
      4-  |                      
       |  |                      
       3- |                      
        | |                      
        2-|                      
         ||                      
         1-                      
                                 
           -----10----           
           |    |    |           
           19   |    |           
            |   |    |           
            -16-|    |           
             | ||    |           
             18||    |           
              |||    |           
              17|    |           
                |    |           
                15   |           
                 |   |           
                 14  |           
                  |  |           
                  13 |           
                   | |           
                   12|           
                    ||           
                    11           
                                 
                      -----20----
                      |    |    |
                      29   |    |
                       |   |    |
                       -26-|    |
                        | ||    |
                        28||    |
                         |||    |
                         27|    |
                           |    |
                           25   |
                            |   |
                            24  |
                             |  |
                             23 |
                              | |
                              22|
                               ||
                               21
                                 
