@    @@@    @@   @     
  @@          @  @        
 @ @     @@   @  @   @@   
@  @    @      @@@  @  @  
@@@@@  @         @     @  
   @   @ @@      @   @@   
  @@@  @@  @  @@@      @  
       @   @        @  @  
        @@@    @@    @@