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2. Coupon (PWB) - Wikipedia

   en.wikipedia.org/wiki/Coupon_(PWB)

   A coupon is designed to include traces and vias with the same dimensions and structures as those of the main PWB. It is standard practice to locate coupons on the edges of a panel, from which multiple PWBs are fabricated, to verify the consistency of plating, etching, and lamination across the whole panel.

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

4. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

5. Card security code - Wikipedia

   en.wikipedia.org/wiki/Card_security_code

   The card security code is located on the back of Mastercard, Visa, Discover, Diners Club, and JCB credit or debit cards and is typically a separate group of three digits to the right of the signature strip On American Express cards, the card security code is a printed, not embossed, group of four digits on the front towards the right

6. Scratchcard - Wikipedia

   en.wikipedia.org/wiki/Scratchcard

   To win an amount of money in this scratch game the player has to find it three times under the scratch area. A scratchcard (also called a scratch off, scratch ticket, scratcher, scratchum, scratch-it, scratch game, scratch-and-win, instant game, instant lottery, scratchie, lot scrots, or scritchies) is a card designed for competitions, often made of thin cardstock or plastic to conceal PINs ...

7. Gold Codes - Wikipedia

   en.wikipedia.org/wiki/Gold_Codes

   Gold Codes are generated daily and provided by the National Security Agency (NSA) to the White House, The Pentagon, United States Strategic Command and TACAMO. For an extra level of security, the list of codes on the card includes codes that have no meaning, and therefore the president must memorize where on the list the correct code is located.