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2. Comma-free code - Wikipedia

   en.wikipedia.org/wiki/Comma-free_code

   Comma-free code. A comma-free code is block code in which no concatenation of two code words contains a valid code word that overlaps both. [1] Comma-free codes are also known as self-synchronizing block codes [2] because no synchronization is required to find the beginning of a code word.

3. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Believed to be the first coupon ever, this ticket for a free glass of Coca-Cola was first distributed in 1888 to help promote the drink. By 1913, the company had redeemed 8.5 million tickets. Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. Coupons were mailed to potential customers and placed in magazines. It is ...

4. en.wikipedia.org

   en.wikipedia.org/wiki/Promo-code-free-shipping

   en.wikipedia.org

5. Wikipedia

   en.wikipedia.org/wiki/Coupon-code-for-free-shipping

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6. Wikipedia

   en.wikipedia.org/wiki/Amazon-coupon-code-free...

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7. Wikipedia

   en.wikipedia.org/wiki/Current-coupon-code-free...

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