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Jun 22nd, 2018
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  1. S -> NUM
  2. | STRING
  3.  
  4. NUM -> DIGIT+
  5.  
  6. DIGIT -> 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
  7.  
  8. STRING -> (ALPHA | DIGIT)+
  9.  
  10. ALPHA -> a | b | ... | Y | Z
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