anchor.diff:      | 'STORE'
       | 'GOJ'
       | 'TCSAJ'
  -    | 'CAF'
  +    | 'CAF'     // Clear and Add Fixed
  +    | 'CAE'     // Clear and Add Erasable
       | 'OCT'
       | 'CADR'
       | 'BANK'
  
positive.code:     | 'UNIT'
      | 'OCTAL'
      | 'ADRES'
      | 'ABVAL'
      ;
  
  label
  
negative.code:     ;
  
  STRING
      : [-a-zA-Z0-9] [a-zA-Z0-9_.+\-/*]*
      ; 
  
  DECIMAL
  