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  2. Error detection and correction - Wikipedia

    en.wikipedia.org/wiki/Error_detection_and_correction

    A checksum of a message is a modular arithmetic sum of message code words of a fixed word length (e.g., byte values). The sum may be negated by means of a ones'-complement operation prior to transmission to detect unintentional all-zero messages.

  3. Encyclopedia - Wikipedia

    en.wikipedia.org/wiki/Encyclopedia

    Encyclopædia Britannica, a printed encyclopedia, and Wikipedia, an online encyclopedia. An encyclopedia [a] is a reference work or compendium providing summaries of knowledge, either general or special, in a particular field or discipline.

  4. List of Downton Abbey characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Downton_Abbey...

    This is a list of characters from Downton Abbey, a British period drama television series created by Julian Fellowes and co-produced by Carnival Films and Masterpiece for ITV and PBS, respectively.

  5. Search engine - Wikipedia

    en.wikipedia.org/wiki/Search_engine

    Some engines suggest queries when the user is typing in the search box.. A search engine is a software system that provides hyperlinks to web pages and other relevant information on the Web in response to a user's query.

  6. Statistics of the COVID-19 pandemic in the United States

    en.wikipedia.org/wiki/Statistics_of_the_COVID-19...

    Weekly confirmed COVID-19 deaths Map of cumulative COVID-19 death rates by US state. [1]The CDC publishes official numbers of COVID-19 cases in the United States. The CDC estimates that, between February 2020 and September 2021, only 1 in 1.3 COVID-19 deaths were attributed to COVID-19. [2]