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As same as Eq. (25), in Eq. (28) and (29), the head "log" is unnecessary. In Eq. (28), $$G_n = - \int q(x) \log p^{}(x)dx$$ is correct and Eq.(29) should be $$= - \int q(x) \log q(x) dx + \int q(x) \log \frac{q(x)}{p^{}(x)}dx.$$
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