Carriers:
        Carriers make deliveries to households. They are identified by:
        Name ( Surname, first name )
        Address ( Street, House Number, Apartment number and Postal Code )
        Phone number.

        It must be possible to create and delete carriers, and modify their
        identifying information (for example if they change phone numbers).

Routes:
        Each carrier delivers to a route, which is a set of households
        receiving subscriptions.
        
        When a household is created, it must be automatically inserted into
        a route based on postal code information.
        It must be possible to move a household to a different route.
        A deleted household must be removed from the route it is on.
        
        When a carrier is created, their route will be empty.
        A carrier can be deleted only when their route is empty.
       
        The system must be able to provide the following information
        about routes:

        On a video display, it must be possible to enter a household
        and determine the carrier responsible for deliveries to that
        household, as well as the subscriptions to be delivered on the
        current day.

        If the route is entered, all households on the route
        must be displayed on the video screen, and it must be possible to
        page up and down through the list.

        It must also be possible to enter a route and view the total
        number of deliveries for each product on the current day.

        When a delivery is made to a carrier, a printout
        of the days deliveries will be attached.
        The system should provide this printout when a single route 
        is selected, or for the entire set of routes. The printout
        must include:

        On page one:
        The carrier name, address and phone number.
        A list of NEW households new to the route for the current day.
        A list of households with suspended deliveries on that day (vacations).

        On successive pages:
        On one line, the household street address and the subscriber name.
        On following lines, indented, each product to be delivered
        on the current day, and the number of copies if greater than one.
        The deliveries to one household will be followed by a blank line,
        and cannot cross a page fold in the printout.

        Sample:

2107  Slowpoke Street                           Fred Manure
            Calgary Herald
            Maclean's
        2   Penthouse
            Reader's Digest

2119  Slowpoke Street                           Alison Smith
            Calgary Sun
            Cosmopolitan

        The end page(s) of the printout for a route will contain a listing
        of the number of each product to be delivered. At the start of
        the day's deliveries, the carrier must determine that the bundle
        received contains sufficient product for the route. Also to
        listed on this page is the depot phone number, to be contacted by
        the carrier if errors have occured.