Swift Beginner Quiz 5

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Quiz 5
1. Used to observe property changes.
2. Code executed before a property changes.
3. Code executed after a property changes.
4. Used to define a generic placeholder.
5. Used to define a protocol requirement.
6. Used to create a weak reference.
7. A reference type that does not increase the reference count.
8. Used to perform work in the background.
9. Represents the current instance.
10. Used to create a thread-safe singleton.
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