7 6 5 4 3 2 1
 

 

7  6  5  4  3  2  1

12   11  10  9  8

 

 

 

 

   

 

                                                           

                    

                                                          

 

 

                             

 

 

 

 

                                             

 

 

                                                       

 

 

            

             

                                                                             

 

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