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4

Two modern handwritten fours 4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. Provided by Wikipedia
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    Sturmian theory for ordinary differential equations / by Reid, William T. (William Thomas), 1907 Oct. 4-1977

    Published 1980
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    Olympic Games by Lang M, Moen MH, van Roy T, Verhagen E, 4, 5, 6

    Published 2021-06-01
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    Sport as Therapy by Martins W, Fernandes VAR, 2, 3, 5, Conte M, 3, 4

    Published 2021-09-01
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