In the nuclear reaction  ${}_{92}{}^{238}\mathrm{U}+{}_0{}^1\mathrm{n}\to {}_{{\mathrm{x}}_1}{}^{\mathrm{A}}\mathrm{X}+{\mathrm{\beta }}^{-}\to {}_{{\mathrm{x}}_2}{}^{\mathrm{B}}\mathrm{Y}+{\mathrm{\beta }}^{-}\to {}_{{\mathrm{x}}_3}{}^{\mathrm{C}}\mathrm{Z}$, values of c and ${\mathrm{x}}_3$ are respectively

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