Consider the situation of a large, online bookstore
They have an inventory of millions of books, with new titles constantly arriving, and old ones being phased out on a regular basis
The price for a book is not a static feature it varies every once in a while
Thousands of books are shipped each day, changing the inventory constantly
Some are returned aganin changing the inventory situation constantly
The cost of each shipped order depends on
Pricess of individual books
Size of the order
Location of the customer
Mode of shipment
For each order the customer's particulars name address phone number credit card number are required.
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