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If you already have serialized your dictionary or array into a
JSON object (encapsulated inside an instance of NSData, see Recipe 8.9), you
should be able to deserialize them back into a dictionary or an array,
using the JSONObjectWithData:options:error: method of
the NSJSONSerialization class. The
object that is returned back by this method will either be a
dictionary or an array, depending on the data that we pass to it. Here
is an example: