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