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2. Digital coupon - Wikipedia

   en.wikipedia.org/wiki/Digital_coupon

   Digital coupons (also known as e-coupons, e-clips or clipped deals) are the digital analogue of paper coupons which are used to provide customers with discounts or gifts in order to attract the purchase of some products. Mostly, grocery and drug stores offer e-coupon services in loyalty program events. Even though there are still traditional ...

3. Hamming code - Wikipedia

   en.wikipedia.org/wiki/Hamming_code

   In mathematical terms, Hamming codes are a class of binary linear code. For each integer r ≥ 2 there is a code-word with block length n = 2r − 1 and message length k = 2r − r − 1. Hence the rate of Hamming codes is R = k / n = 1 − r / (2r − 1), which is the highest possible for codes with minimum distance of three (i.e., the minimal ...

4. en.wikipedia.org

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

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5. Drug coupon - Wikipedia

   en.wikipedia.org/wiki/Drug_Coupon

   Drug coupon. A drug coupon is a coupon intended to help consumers save money on pharmaceutical drugs. They are offered by drug companies or distributed to consumers via doctors and pharmacists, and most can be obtained online. There are drug coupons for drugs from many categories such as cholesterol, acne, migraine, allergies, etc.

6. en.wikipedia.org

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

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7. en.wikipedia.org

   en.wikipedia.org/wiki/amazon-free-fast-shipping-code

   en.wikipedia.org