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Can NSMutableDictionary be turned into NSArray?

Not sure if I misunderstood the lecture but in lecture Collection Types: Arrays and Dictionaries at min 10:48

I see NSArray *sunkenCity = [cities objectAtIndex:1]; and that object at index 1 is an NSMutableDictionary.

So is it that simple, where we can convert an NSMutableDictionary into an NSArray?