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This work considers $K^0, \bar K^0$ meson mixings and oscillations via$K^0_1, K^0_2$ meson states at strangeness violation by weak interactions intwo cases - without and with taking into account $K^0_1, K^0_2$ meson decays.In the first case the oscillation theory correctly describes $K^o, \bar K^o \toK^o, \bar K^o$ transition processes. In the second case, when we take intoaccount meson decays, the oscillation theory cannot correctly describe thisprocess at long distances since mainly $K^o_2$ mesons remain at long distancestherefore the condition for oscillations is absent. So, at long distances inthis process only long living $K^0_2$ mesons are present but not $K^o, \barK^o$ mesons.

About $K^o, \bar K^o$ meson oscillations at strangeness violation by weak interactions without and with taking into account meson decays