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OCR: Traversal Borrower3 Book3 Address Name The Borrower : Borrowers The Book's , Book " [] BorrowBook ( Borrower3*) BorrowBook (Book+) friend class Borrower3 friend class Book3 GetBorrower () : Borrowers* ListBooksonLoan () ReturnBook () ReturnBook (Book*) Figure 4 - Class diagram for a bidirectional traversal with friends.