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The process of retrieving data within a nested json structure involves the following steps:

1. Understand the structure of the json data: Identify the key-value pairs and nested structures within the json data.

2. Access the data: Use the dot notation or square brackets to access the data within the json structure.

3. Navigate through the nested json structure: Use a combination of dot and square bracket notation to navigate through the nested json structure to access the specific data you need.

4. Use loops and conditional statements: If you need to extract data from multiple nested arrays or objects, you may need to use loops and conditional statements to retrieve the data.

5. Convert json string to object: If the json data is in string format, you will need to parse it using a JSON parser to convert it into an object that can be accessed and navigated.