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