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** A perpetual-motion machine of the second kind **

** Asymmetric transformation of the second kind **

** Bessel function of the second kind **

** Crystal Imperfection of the Second Kind **

** Electrophoresis of the Second Kind **

** Errors of the First and Second Kind **

** Isotope effect of the second kind **

** Perpetual motion machines of the second kind **

** Perpetual motion of the second kind **

** Reference electrodes of the second kind **

** Scalar relaxation of the second kind **