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