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  2. Association football positions - Wikipedia

    en.wikipedia.org/wiki/Association_football_positions

    Their position is rather more fluid than other defenders who mark their designated opponents. [21] The sweeper's ability to read the game is even more vital than for a centre-back. [ 22 ] The catenaccio system of play, used in Italian football in the 1960s, notably employed a defensive libero. [ 23 ]

  3. Jari Litmanen - Wikipedia

    en.wikipedia.org/wiki/Jari_Litmanen

    Jari Olavi Litmanen (pronounced [ˈjɑri ˈlitmɑnen] ⓘ; born 20 February 1971) is a Finnish former professional footballer who played as an attacking midfielder or a second striker. He was the first-choice captain of the Finland national team between 1996 and 2008 in an international career that ran from 1989 to 2010.

  4. Bowling ball - Wikipedia

    en.wikipedia.org/wiki/Bowling_ball

    Bowling ball motion [21] is commonly broken down into sequential skid, hook, and roll phases. [ 24 ] [ 25 ] As the ball travels down the lane in the skid and hook phases, frictional contact with the lane causes the ball's forward ( translational ) speed to continually decrease, but to continually increase its rev rate ( rotational speed). [ 26 ]

  5. 21 cm Mörser 16 - Wikipedia

    en.wikipedia.org/wiki/21_cm_Mörser_16

    In German service, it used two shells, the 21 cm Gr 18 that weighed 113 kg (249 lb) and the 21 cm Gr 18 Be concrete-piercing shell of 121.4 kg (268 lb) with a filler of 11.61 kg (25.6 lb) of TNT. They remained in first-line use with the Germans until replaced by the 21 cm Mörser 18 by about 1940. Afterwards, they were used for training ...

  6. Hyperbola - Wikipedia

    en.wikipedia.org/wiki/Hyperbola

    [21] [22] The following are also concurrent: (1) the circle that is centered at the hyperbola's center and that passes through the hyperbola's vertices; (2) either directrix; and (3) either of the asymptotes. [22] Since both the transverse axis and the conjugate axis are axes of symmetry, the symmetry group of a hyperbola is the Klein four-group.