. The Library of Congress Number (LCN) system are used bylibraries to place books on shelves. Every book has a unique LCN.Each LCN has three parts: call letters, a call number, and cutters.The call letters are two uppercase letters. The call number is anumber between 1and 10,000, inclusive, possibly including a decimalpart with at most 3 digits. The cutters are a letter followed by 0to 9 digits. Books are placed in order of their call letters (AAprecedes AB, etc.); books with the same call letters appear inincreasing value of their call numbers; books with the same callletters and call number
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