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				@@ -8,17 +8,17 @@ using namespace std; 
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				 // Iterates though all people in the AddressBook and prints info about them. 
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				 void ListPeople(const tutorial::AddressBook& address_book) { 
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				-  for (int i = 0; i < address_book.person_size(); i++) { 
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				-    const tutorial::Person& person = address_book.person(i); 
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				+  for (int i = 0; i < address_book.people_size(); i++) { 
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				+    const tutorial::Person& person = address_book.people(i); 
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				     cout << "Person ID: " << person.id() << endl; 
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				     cout << "  Name: " << person.name() << endl; 
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				-    if (person.has_email()) { 
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				+    if (person.email() != "") { 
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				       cout << "  E-mail address: " << person.email() << endl; 
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				     } 
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				-    for (int j = 0; j < person.phone_size(); j++) { 
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				-      const tutorial::Person::PhoneNumber& phone_number = person.phone(j); 
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				+    for (int j = 0; j < person.phones_size(); j++) { 
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				+      const tutorial::Person::PhoneNumber& phone_number = person.phones(j); 
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				       switch (phone_number.type()) { 
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				         case tutorial::Person::MOBILE: 
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