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2. Groupon - Wikipedia

   en.wikipedia.org/wiki/Groupon

   Boomerang's two cofounders, Zachary Smith and Matthew Williams, along with eight employees went on to build a new digital-coupon offering, called Groupon Coupons. [ 61 ] On January 11, 2013, Groupon acquired real-time location sharing mobile app and small business service provider Glassman, which was founded and led by Geoffrey Woo , Jon Zhang ...

3. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Internet coupons: Online retailers often refer to ... [20] [21] Apps: Related to classic coupons are ... Often coupons are available for purchase at some online ...

4. Universal Product Code - Wikipedia

   en.wikipedia.org/wiki/Universal_Product_Code

   A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...