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There are three distinct types of penguin contributions: (i) $b\\to sq\\bar q\\to s\\eta_{q}$, (ii) $b\\to ss\\bar s\\to s\\eta_s$, and (iii) $b\\to s q\\bar q\\to q \\bar K_h$, where $\\eta_q=(u\\bar u+d\\bar d)/\\sqrt{2}$ and $\\eta_s=s\\bar s$. $B\\to K^{(*)}\\eta^{(')}$ decays are dominated by type-II and type-III penguin contributions. 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