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class AddressBook {
private AddressBookRepository repository;
public AddressBook(AddressBookRepository repository) {
this.repository = repository;
public Address getAddressById(int i) {
return repository.findById(i);
class AddressBookRepository {
public Address findById(int i) {
return new Address(i);
class Address {
private int i;
public Address(int i) {
this.i = i;
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