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swift2 - How do I iterate through a [String:[String]] Dictionary in Swift

I have a dictionary.

var params: [String: [String]] = [:]

I assign an array to the first key and the first key only. Now print params prints :

["names" : ["jack", "joe", "jill"]]

How do I iterate through this array at this given key so that I could loop through and print jack, joe, and jill?

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for (key, names) in params {
    for name in names {
        print("(name))
    }
}

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