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  2. Left 4 Dead - Wikipedia

    en.wikipedia.org/wiki/Left_4_Dead

    Left 4 Dead is a 2008 first-person shooter game developed by Valve South and published by Valve.It was originally released for Windows and Xbox 360 in November 2008 and for Mac OS X in October 2010, and is the first title in the Left 4 Dead series.

  3. 2–3–4 tree - Wikipedia

    en.wikipedia.org/wiki/2–3–4_tree

    234 trees are B-trees of order 4; [1] like B-trees in general, they can search, insert and delete in O(log n) time.One property of a 234 tree is that all external nodes are at the same depth.

  4. Rules of cribbage - Wikipedia

    en.wikipedia.org/wiki/Rules_of_cribbage

    For example, a run of three cards with an additional card matching one of the three in rank, e.g., 2–2–3–4, is termed a "double run of three" and scores eight according to the above rules (two distinct runs of three and two for the pair); 2–2–3–4–5 is a "double run of four" for ten points (two distinct runs of four and two for the ...

  5. Natural logarithm of 2 - Wikipedia

    en.wikipedia.org/wiki/Natural_logarithm_of_2

    In a third layer, the logarithms of rational numbers r = ⁠ a / b ⁠ are computed with ln(r) = ln(a) − ln(b), and logarithms of roots via ln n √ c = ⁠ 1 / n ⁠ ln(c).. The logarithm of 2 is useful in the sense that the powers of 2 are rather densely distributed; finding powers 2 i close to powers b j of other numbers b is comparatively easy, and series representations of ln(b) are ...

  6. Formation (association football) - Wikipedia

    en.wikipedia.org/wiki/Formation_(association...

    3–4–1–2 is a variant of 3–5–2 where the wingers are more withdrawn in favour of one of the central midfielders being pushed further upfield into the "number 10" playmaker position. Martin O'Neill used this formation during the early years of his reign as Celtic manager, noticeably taking them to the 2003 UEFA Cup Final .