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2. Buy one, get one free - Wikipedia

   en.wikipedia.org/wiki/Buy_one,_get_one_free

   Buy one, get one free. " Buy one, get one free " or " two for the price of one " is a common form of sales promotion. Economist Alex Tabarrok has argued that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion ...

3. Letter frequency - Wikipedia

   en.wikipedia.org/wiki/Letter_frequency

   Letter frequency is the number of times letters of the alphabet appear on average in written language. Letter frequency analysis dates back to the Arab mathematician Al-Kindi ( c. 801 –873 AD), who formally developed the method to break ciphers. Letter frequency analysis gained importance in Europe with the development of movable type in 1450 ...

4. IQ classification - Wikipedia

   en.wikipedia.org/wiki/IQ_classification

   All longitudinal studies of IQ have shown that test-takers can bounce up and down in score, and thus switch up and down in rank order as compared to one another, over the course of childhood. IQ classification categories such as "profoundly gifted" are those based on the obsolete Stanford–Binet Third Revision (Form L-M) test. [114]

5. Ten-code - Wikipedia

   en.wikipedia.org/wiki/Ten-code

   Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]

6. Promotion (marketing) - Wikipedia

   en.wikipedia.org/wiki/Promotion_(marketing)

   The word entered the English language in the 14th century. The use of the term promotion to refer to "advertising or publicity" is very modern and is first recorded in 1925. It may be a contraction of a related term, sales promotion, which is one element in the larger set of tools used in marketing communications.

7. 2020 United States presidential election - Wikipedia

   en.wikipedia.org/wiki/2020_United_States...

   The 2020 United States presidential election was the 59th quadrennial presidential election, held on Tuesday, November 3, 2020. The Democratic ticket of former vice president Joe Biden and the junior U.S. senator from California Kamala Harris defeated the incumbent Republican president, Donald Trump, and vice president, Mike Pence.