01List all countries within a specific geographic region, including name, capital, population, and flag.
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03Search for countries by name, returning common name, official name, capital, region, subregion, population, area, languages, currencies, and flag emoji.
04Retrieve full country information using ISO 3166-1 alpha-2 or alpha-3 codes.
05Find all countries where a particular language is spoken, showing name, capital, region, and population.
06Identify all countries that use a specified currency, providing name, capital, and region.