anchor.diff:        PARAMETER ( POW=401,   MUL=402,   DIV=403,  FDIV=404,  MODU=405)
         INTEGER     ADD,       SUB,      OPER
         PARAMETER ( ADD=406,   SUB=407,  OPER=400)
  +      INTEGER     GRP,      OGRP,      CGRP,      OPAR,      CPAR
  +      PARAMETER ( GRP=500,  OGRP=510,  CGRP=520,  OPAR=511,  CPAR=521)
   *
         INTEGER     ERR,       NEW,      PUSH,      FLSH
         PARAMETER ( ERR=0,     NEW=101,  PUSH=102,  FLSH=103)
  
positive.code:       PARAMETER ( POW=401,   MUL=402,   DIV=403,  FDIV=404,  MODU=405)
        INTEGER     ADD,       SUB,      OPER
        PARAMETER ( ADD=406,   SUB=407,  OPER=400)
  *
        INTEGER     ERR,       NEW,      PUSH,      FLSH
        PARAMETER ( ERR=0,     NEW=101,  PUSH=102,  FLSH=103)
  
negative.code:       PARAMETER ( POW=401,   MUL=402,   DIV=403,  FDIV=404,  MODU=405)
        INTEGER     ADD,       SUB,      OPER
        PARAMETER ( ADD=406,   SUB=407,  OPER=400)
        INTEGER     GRP,      OGRP,      CGRP,      OPAR,      CPAR
        PARAMETER ( GRP=500,  OGRP=510,  CGRP=520,  OPAR=511,  CPAR=521)
  *
        INTEGER     ERR,       NEW,      PUSH,      FLSH
        PARAMETER ( ERR=0,     NEW=101,  PUSH=102,  FLSH=103)
  