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What are the correct postcode formats around the world?
List of postal codes - Wikipedia
The UK Postcode Format
Postcodes in the United Kingdom - Wikipedia
Postal code - Wikipedia
What is a Postal Code? Origins, Formats, and Applications.
The format and layout of UK postcode units
CSV & MySQL Postcodes - UK Postcode Format
UK Postcode Format - How To Write A Postcode - Winterville
Programmers guide to UK postcodes - GetTheData
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