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In the class of real hypersurfaces $M^{2n-1}$ isometrically immersed into a nonflat complex space form ${\tilde{M}}_n\left(c\right)$ of constant holomorphic sectional curvature $c$ $(\ne 0)$ which is either a complex projective space $ℂP^n\left(c\right)$ or a complex hyperbolic space $ℂH^n\left(c\right)$ according as $c>0$ or $c<0$, there are two typical examples. One is the class of all real hypersurfaces of type (A) and the other is the class of all ruled real hypersurfaces. Note that the former example are Hopf manifolds and the latter are non-Hopf manifolds. In this...