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