Convert to and from Iso3166 country codes.
CountryCode from two-letter ISO 3166-1 alpha-2 code.
Three-letter ISO 3166-1 alpha-3 code from CountryCode.
CountryCode from three-letter ISO 3166-1 alpha-3 code.
ISO 3166-1 numeric code from CountryCode.
CountryCode from ISO 3166-1 numeric code.
All CountryCodes sorted alphabetically.
GT and LT are defined in Basics so we define them as GT_ and LT_.
Two-letter
ISO 3166-1 alpha-2code fromCountryCode.