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  2. Comma-free code - Wikipedia

    en.wikipedia.org/wiki/Comma-free_code

    Comma-free code. A comma-free code is block code in which no concatenation of two code words contains a valid code word that overlaps both. [1] Comma-free codes are also known as self-synchronizing block codes [2] because no synchronization is required to find the beginning of a code word.

  3. Code of Federal Regulations - Wikipedia

    en.wikipedia.org/wiki/Code_of_Federal_Regulations

    Administrative law of the United States. In the law of the United States, the Code of Federal Regulations ( CFR) is the codification of the general and permanent regulations promulgated by the executive departments and agencies of the federal government of the United States. The CFR is divided into 50 titles that represent broad areas subject ...

  4. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    Ten-code. Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by law enforcement 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]

  5. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

  6. POSTNET - Wikipedia

    en.wikipedia.org/wiki/POSTNET

    POSTNET ( Post al N umeric E ncoding T echnique) is a barcode symbology used by the United States Postal Service to assist in directing mail. The ZIP Code or ZIP+4 code is encoded in half- and full-height bars. [1] Most often, the delivery point is added, usually being the last two digits of the address or PO box number.

  7. Prefix code - Wikipedia

    en.wikipedia.org/wiki/Prefix_code

    Prefix code. A prefix code is a type of code system distinguished by its possession of the "prefix property", which requires that there is no whole code word in the system that is a prefix (initial segment) of any other code word in the system. It is trivially true for fixed-length code, so only a point of consideration in variable-length code .

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