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Method Signature	`CityStateZip getCityState(String zip);`
Description	Takes a zip and does a city and state lookup with the United States Postal Service.
Result	A CityStateZip object.

Discussion

Make the remote call
Check to make sure the result is not null. If it is, a system error occurred.
Check CityStateZip .validZip flag. If false, the zip was invalid.
If zip was valid, city and state will be populated and may be used.

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