The answer to exercise marked [BB]can be found in the Back of the Book.
(a) [BB] Give an example of a valid universal product number that differs from the valid number 1-23456-98732-6 in the fourth and fifth positions.
(b) [BB] Give an example of an invalid product number that differs from the valid number 1-23456-98732-6 in the fourth and fifth positions.
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