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Problem:
The client wants the language code to appear in the directory structure of the URL instead of as a parameter.

Solution:
1. Navigate to WPML >> Languages > Language URL format.
2. Choose the "Different languages in directories" option and click the Save button.
3. Re-save the Permalinks by going to Settings >> Permalinks and clicking the Save Changes button.
4. Clear all types of cache from your site/server.

For more detailed instructions, please refer to our documentation: Language URL options.