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