You must place them in their rightful spots on the big Music Box, located in the Lobby. There will be three indentations with an engraving next to each. Read the descriptions to figure out which box ...

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Discover how credit card validation codes work and protect against fraud. Learn about their placement, security role, and examples to secure online transactions.

Discover how the Luhn Algorithm verifies credit card accuracy, supports secure transactions, and helps prevent errors in inputting Social Security numbers.