       xx       
       xx       
       xx       
     xxxxxx     
     xx  xx     
     x xx x     
     xx  xx     
    x  xx  x    
    x x  x x    
    xx    xx    
   xx  .   xx   
   x x    x x   
   x  x  x  x   
   x   xx   x   
  x   x  x   x  
  x  x    x  x  
  x x      x x  
  xx        xx  
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