أرسل هذا في رسالة قصيرة: Color Groups Associated with Square and Hexagonal Lattices

             ___     _____       ___      ____    
    ___     / _ \\  |  __ \\    / _ \\   |  _ \\  
   /   ||  / //\ \\ | |  \ ||  / //\ \\  | |_| || 
  | [] || |  ___  ||| |__/ || |  ___  || | .  //  
   \__ || |_||  |_|||_____//  |_||  |_|| |_|\_\\  
    -|_|| `-`   `-`  -----`   `-`   `-`  `-` --`  
     `-`