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