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70
CROOKED ANSWERS.
[Ch. III.
  1. All are ;
    No are .
    i.e.
    0    
       
       
    0     1
  2. All are ;
    All are .
    i.e.
    0     0
      1 0  
      0  
       

    [See remarks on No. 7, p. 60]
  3. No are ;
    No are .
    i.e.
    0    
       
      0 0  
    0    
  4. All are ;
    All are .
    i.e.
       
      1 0  
      0 0  
       
[See pp. 49, 50]