\begin{frame}{Exercises (1)} \begin{exampleblock}{} Find a grammar $G$ such that \begin{talign} L(G) = \{a,b\}^*\,\{c\}\,\{b,c\}^* \end{talign} \pause There are many possible solutions! \pause\medskip One possible solution is: \begin{talign} S &\to XcY \\ \mpause[1]{X &\to aX \mid bX \mid \lambda} \\ \mpause{Y &\to bY \mid cY \mid \lambda} \end{talign} \end{exampleblock} \end{frame}