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  2. Gift card - Wikipedia

    en.wikipedia.org/wiki/Gift_card

    Gift card for a U.S hardware store. A gift card, also known as a gift certificate in North America, or gift voucher or gift token in the UK, is a prepaid stored-value money card, usually issued by a retailer or bank, to be used as an alternative to cash for purchases within a particular store or related businesses. Gift cards are also given out ...

  3. 4 Best Places To Buy Gift Cards at a Discount - AOL

    www.aol.com/4-best-places-buy-gift-220002635.html

    Discount gift cards are a great way to save money on everyday purchases or gifts. Learn about the best places to buy them and where to get savings of up to 20% or more.

  4. Lockheed Martin F-22 Raptor - Wikipedia

    en.wikipedia.org/wiki/Lockheed_Martin_F-22_Raptor

    The Lockheed Martin/Boeing F-22 Raptor is an American twin-engine all-weather stealth fighter aircraft developed and produced for the United States Air Force (USAF). As a product of the USAF's Advanced Tactical Fighter (ATF) program the aircraft was designed as an air superiority fighter, but also incorporates ground attack, electronic warfare, and signals intelligence capabilities.

  5. Card counting - Wikipedia

    en.wikipedia.org/wiki/Card_counting

    Card counters are advantage players who try to overcome the casino house edge by keeping a running count of high and low valued cards dealt. They generally bet more when they have an advantage and less when the dealer has an advantage.

  6. Illinois - Wikipedia

    en.wikipedia.org/wiki/Illinois

    Illinois is the most populous state in the Midwest region. Chicago, the third-most populous city in the United States, is the center of the Chicago metropolitan area or Chicagoland, as this area is nicknamed. Although the Chicago metropolitan area comprises only 9% of the land area of the state, it contains 65% of the state's residents.

  7. Contract bridge probabilities - Wikipedia

    en.wikipedia.org/wiki/Contract_bridge_probabilities

    Suppose East is known to have 7 spades from the bidding and after seeing dummy you deduce West to hold 2 spades; then if your two lines of play are to hope either for diamonds 5-3 or clubs 4-2, the a priori probabilities are 47% and 48% respectively but and so now the club line is significantly better than the diamond line.

  8. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    The Luhn algorithm or Luhn formula, also known as the " modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in U.S. Patent No. 2,950,048, granted on August 23, 1960. [1]

  9. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A gray card is a middle gray reference, typically used together with a reflective light meter, as a way to produce consistent image exposure and/or color in video production, film, and photography . A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum.