anchor.diff:  l_exec_timeout
   :
      EXEC_TIMEOUT minutes = DEC seconds = DEC? NEWLINE
  +;
  +
  +l_length
  +:
  +   (LENGTH DEC NEWLINE)
  +   |
  +   (NO LENGTH NEWLINE)
   ;
   
   l_login
  
positive.code:       | FLUSH_AT_ACTIVATION
        | HISTORY
        | IPV6
        | LENGTH DEC
        | LOCATION
        | LOGGING
        | LOGOUT_WARNING
  
negative.code:    (
        l_access_class
        | l_exec_timeout
        | l_length
        | l_login
        | l_null
        | l_transport
  