459 beamer: \begin{frame}, \begin_layout Frame
\begin{frame}[plain], \begin_layout PlainFrame
\begin{frame}[fragile] \begin_layout FragileFrame
459 beamer: \begin{frame}, \begin_layout Frame
\begin{frame}[plain], \begin_layout PlainFrame
\begin{frame}[fragile] \begin_layout FragileFrame
\twocolumn[]{}{} Layout Twocolumn, InsetArgument
\item[]<> InsetArgument
\begin{enumerate|itemize|...}[] InsetArgument
\twocolumn[]{}{} Layout Twocolumn, InsetArgument
\item[]<> InsetArgument
\begin{enumerate|itemize|...}[] InsetArgument