This question runs in a pre-configured Salesforce environment - no personal connection required.

Count countries in a specified region using REST Countries v3.1. Return null for null input. Endpoint: https://restcountries.com/v3.1/region/{region}

Examples:

Input: region = 'Europe' Output: 50 Explanation: There are 50 countries in the Europe region Input: region = 'Asia' Output: 48 Explanation: There are 48 countries in the Asia region
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