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I'm not really sure what this is asking
I don't understand what the question is asking me to do
Ok, so first you have to realize that declaring a variable to type id allows you to later assign that variable to any to just about any type of Objective-C object. Now, sure we could use the long syntax to make the variable thing of type NSNumber, but it will be much easier to use the shorthand convenience constructor.
id thing = nil; thing = @4;