LK - Wikipedia
https://en.wikipedia.org/wiki/LK
WEBSystem LK, in mathematics, the classical sequent calculus; LK (spacecraft), a Soviet lunar lander; Other uses. LK (index mark code), county Limerick, Ireland, vehicle registration; LK I, a German light tank prototype of the World War I; LK II, a German light tank of World War I; LK-700, a Soviet direct ascent lunar lander program proposed in 1964
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