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