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\iflatexml\begin{example}  As an example, we write down the probability density of the \textbf{normal distribution}.  \begin{equation}\label{eqn:normal} \begin{equation}  \label{eqn:normal}  φ(x, \mu, \sigma) = \frac{1}{\sqrt{2\pi\sigma^2} } e^{ -\frac{(x-\mu)^2}{2\sigma^2} }  \end{equation}  \end{example}\fi