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4 changes: 2 additions & 2 deletions data/part-10/4-application-development.md
Original file line number Diff line number Diff line change
Expand Up @@ -807,9 +807,9 @@ This removes an _unnecessary dependency_ from the `PhoneBookApplication` class.

```python
class PhoneBookApplication:
def __init__(self, filename):
def __init__(self, storage_service):
self.__phonebook = PhoneBook()
self.__filename = filename
self.__storage_service = storage_service

# the rest of the user interface

Expand Down