30 30
  X X       X           X     
 X     X  X  X                
                     X  X   X 
   X       X  X     X    X  X 
 X X    XXX   X       X X     
       X         X X   X      
               XXX   X   X    
X    X  XX X  X X      X X    
 XXXX X      X       X  XX    
   X X X X  X         X X X   
   X             X X XX   XX  
X    X XXX    X    X      X   
   X      X X    X        X   
        X  X X    X  X    X   
       XXX XX        XXXX     
  X    X  X    X        X  X  
      X  X  XX   X       XX  X
X X    X    X    X       X    
 X         X  X     XX       X
X     X  X               XX  X
     XX      X      X X       
           X X  X   X        X
           X X      X         
 X  X  X   XX  XX X  X        
  XX   X X X          X  XX  X
        X   X              X  
  X  X  X     X               
   XX   X        XXX X   X X X
    X  XXX    X X     XX X    
X              X    XX  XX   X
20 28 12 19
5 9 11 13
3 18 10 25
8 12 6 21
9 12 22 28
0 0 0 0
0 0