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Other times you may wish to differentiate by country as well as language. To accomplish this, you can add a two-letter country code from [ISO 3166](http://www.iso.org/iso/english_country_names_and_code_elements) after the language code. The sample uses this convention for the Flag.en-US.png and Flag.en-GB.png files. Both flags are for English-speaking countries, but this specialization allows us to differentiate between the United States and United Kingdom. If you set your system to some other English-speaking country—for example, New Zealand—neither of these flags will match, so the default flag will be displayed instead. Because the sample does not specify any particular French-speaking country for its French flag texture, that will be displayed even if you set your system to French (Canada) or French (Belgium).
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