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The families $Y_n$, $Z_n$ have $b_2=3$, $4$ and the boundaries are 3-manifolds with $b_1=1$, $0$ respectively. We give a plug (or g-cork) twist $(P,\\varphi_{p,q})$ producing the 2-bridge knot or link surgery by combining the plug $(P,\\varphi)$. 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