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Telegraph code - Wikipedia
How Google used plus codes to create 14,000 new addresses in Brazil
What is a Referral Code [How to Get It for Your Customers]
8 Ways to Use QR Codes in Higher Education Classrooms
Alpha Codes Used by Pilots: Decoding the ABCs of Aviation
How the UPC Code Works
Why you shouldn't ever send verification codes to anyone
How to Create Secret Codes and Ciphers: 15 Fun Ideas
Black Codes
The International Building Code - ICC
DOORS Codes - Roblox
SMS Short Codes - What Businesses Needs to Know