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In this work, assuming that $P_{cs}(4459)$ is a $\\bar{D}^*\\Xi_c$ molecular state, we study this decay via triangle diagrams $\\Xi_b\\rightarrow \\bar{D}_s^{(*)}\\Xi_c\\to (\\bar{D}^{(*)}\\bar{K})\\Xi_c\\to P_{cs} \\bar{K}\\to (J/\\psi\\Lambda) \\bar{K}$. 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