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  1. or download this
        
N=3

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a     R  G
b  R     B
c  G  B
  2. or download this
        
N=4

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b  R     B  Y
c  G  B     R  
d  B  Y  R
  3. or download this
        
N=5

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c  G  B     C  R        
d  B  Y  C     G    
e  Y  C  R  G
  4. or download this
        
N=6

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d  B  Y  C     R  G    
e  Y  C  M  R     B     
f  C  M  R  G  B