Swift Intermediate Quiz 2

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Quiz 2
1. Used to restrict a generic type to a specific protocol.
2. Automatically synthesize equatable conformance.
3. Accessing properties within a chain of optionals.
4. A protocol that allows objects to be used as keys.
5. The pattern for a thread-safe singleton.
6. Used to execute blocks of code on specific queues.
7. A type alias for a specific function signature.
8. Defining a custom implementation for an existing protocol.
9. A way to handle memory management with strong references.
10. Using subscripts to access data in a custom collection.
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