bu4, ~{2=~}
       8        
    8  8        
    8  8   8    
    8  888888   
    8  8        
    8  8     8  
888888888888888 
       8        
    8  8   8    
    88 8   88   
   8   8  8     
  8    8  8     
        88      
      88        
    88          
 888