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\begin{example}  In equation \ref{eqn:standardnormal}, we write down the \textit{standard normal distribution}.  \begin{equation}\label{eqn:standardnormal}  \phi(x) = \frac{e^{- \frac{\scriptscriptstyle 1}{\scriptscriptstyle 2} x^2}}{\sqrt{2\pi}}\,   \end{equation}