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