v3 Putting it all together

Here's the sequence of API calls you should be doing to achieve the following results:
- Retrieve list of countries (1)
- For a specific country, retrieve list of areas (2)
- For a specific area, retrieve list of prefixes (3)
- For a specific prefix, retrieve list of numbers (4)
- Rent number (5)

For each of these functions (2 through 5) , you will use as parameters values obtained from previous API call.

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