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/usr/share/lyx/examples/beamer-article.lyx is in lyx-common 2.2.2-1.

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The actual contents of the file can be viewed below.

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#LyX 2.2 created this file. For more info see http://www.lyx.org/
\lyxformat 508
\begin_document
\begin_header
\save_transient_properties true
\origin /systemlyxdir/examples/
\textclass article-beamer
\use_default_options true
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman "default" "default"
\font_sans "default" "default"
\font_typewriter "default" "default"
\font_math "auto" "auto"
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100 100
\font_tt_scale 100 100
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize default
\spacing single
\use_hyperref true
\pdf_bookmarks true
\pdf_bookmarksnumbered false
\pdf_bookmarksopen false
\pdf_bookmarksopenlevel 1
\pdf_breaklinks false
\pdf_pdfborder true
\pdf_colorlinks false
\pdf_backref false
\pdf_pdfusetitle true
\papersize default
\use_geometry false
\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 0
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 0
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\end_index
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\quotes_language english
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Standard
\begin_inset Note Note
status open

\begin_layout Itemize
This is an accompanying document to the beamer example (see 
\family sans
Help\SpecialChar menuseparator
Specific Manuals\SpecialChar menuseparator
Beamer Presentation
\family default
).
 It demonstrates how easy it is to generate a handout via the 
\begin_inset Quotes eld
\end_inset

article
\begin_inset Quotes erd
\end_inset

 mode.
\end_layout

\begin_layout Itemize
Except for the document class, you probably want most of the same document
 settings as the included document.
 For example, if you have Natbib author-year in child, you should have it
 here as well.
 If you use a module in the child, include it here also.
 You might not need to copy some parts of the preamble, for example 
\backslash
setbeamertemplate{...}.
\end_layout

\begin_layout Itemize
If you get a warning message about different text classes when you view
 PDF, you can safely click 
\begin_inset Quotes eld
\end_inset

Do not show this warning again!
\begin_inset Quotes erd
\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset CommandInset include
LatexCommand include
filename "beamer.lyx"

\end_inset


\end_layout

\end_body
\end_document