Data flow diagram The book ordering sub-system can help libraries require new books. It includes the following functionalities: (1) The book suppliers provide list of new books to the system. (2) The system receives the list of requested books from book ordering staffs. (3) The system records the lists of new books and requested books. (4) The system returns the information of book ordering to the book suppliers. (5) The system returns the information of unavailable books to book ordering staffs. (6) The system automatically checks the duplicated books in the library, and return the feedbacks to book ordering staffs. Please create the DFD for this sub-system.

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