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2. Black Codes (United States) - Wikipedia

   en.wikipedia.org/wiki/Black_Codes_(United_States)

   The Black Codes, sometimes called the Black Laws, were laws which governed the conduct of African Americans (both free and freedmen).In 1832, James Kent wrote that "in most of the United States, there is a distinction in respect to political privileges, between free white persons and free colored persons of African blood; and in no part of the country do the latter, in point of fact ...

3. Hyperbolic discounting - Wikipedia

   en.wikipedia.org/wiki/Hyperbolic_discounting

   Hyperbolic discounting is mathematically described as = +where g(D) is the discount factor that multiplies the value of the reward, D is the delay in the reward, and k is a parameter governing the degree of discounting (for example, the interest rate).

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. Coupon (finance) - Wikipedia

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

   Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. [2] For example, if a bond has a face value of $1,000 and a coupon rate of 5%, then it pays total coupons of $50 per year.

6. Serial shipping container code - Wikipedia

   en.wikipedia.org/wiki/Serial_Shipping_Container_Code

   The Serial Shipping Container Code (SSCC) is an 18-digit number used to identify logistics units. In order to automate the reading process, the SSCC is often encoded in a barcode , generally GS1-128 , and can also be encoded in an RFID tag.

7. List of country calling codes - Wikipedia

   en.wikipedia.org/wiki/List_of_country_calling_codes

   Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.