anchor.diff:  
   condition
       : term
  -    | (term (LT | GT | EQUALS) term)
  +    | (term (NGT | NLT | LT | GT | EQUALS) term)
       ;
   
   identifier
  
positive.code: 
  DIVIDE
      : '/'
      ;
  
  EQUALS
  
negative.code:     : '}'
      ;
  
  NGT
      : '\'>'
      ;
  
  NLT
      : '\'<'
      ;
  
  GT
      : '>'
      ;
  