Ruby Intermediate Quiz 4

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Quiz 4
1. Used to define protected methods.
2. Used to find the difference between two arrays.
3. Used to concatenate two arrays.
4. Used to define a singleton method for a specific instance.
5. Used to convert a hash to an array of pairs.
6. Used to execute a method if the object responds to it.
7. Used to get all keys of a hash.
8. Used to find a value by key.
9. Used to remove all elements from a collection.
10. Used to get the current working directory.
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