anchor.diff:     ;
   
   
  +DSEG
  +   : D S E G
  +   ;
  +
  +
  +CSEG
  +   : C S E G
  +   ;
  +
  +
   REP
      : R E P
      ;
  
positive.code:    ;
  
  org
     : ORG string
     ;
  
  title
  
negative.code:    | equ
     | db
     | dw
     | cseg
     | dseg
     | title
     | include
     ;
  
  cseg
     : CSEG
     ;
  
  dseg
     : DSEG
     ;
  
  dw
     : DW expressionlist
     ;
  