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