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/usr/share/libreoffice/help/en-US/smath.tree is in libreoffice-help-en-us 1:4.2.3~rc3-0ubuntu1.

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<?xml version="1.0" encoding="UTF-8"?>
<!--
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
-->
<tree_view version="24-Aug-2004">
	<help_section application="smath" id="03" title="Formulas">
		<node id="0301" title="General Information and User Interface Usage">
<topic id="smath/text/smath/main0000.xhp">Welcome to the %PRODUCTNAME Math Help</topic>
<topic id="smath/text/smath/main0503.xhp">%PRODUCTNAME Math Features</topic>
<topic id="smath/text/smath/guide/main.xhp">Instructions for Using %PRODUCTNAME Math</topic>
<topic id="smath/text/smath/guide/keyboard.xhp">Shortcuts (%PRODUCTNAME Math Accessibility)</topic>
		</node>
		<node id="0302" title="Command and Menu Reference">
<topic id="smath/text/smath/main0100.xhp">Menus</topic>
<topic id="smath/text/smath/main0200.xhp">Toolbars</topic>
		</node>
		<node id="0303" title="Working with Formulas">
<topic id="smath/text/smath/guide/align.xhp">Manually Aligning Formula Parts</topic>
<topic id="smath/text/smath/guide/attributes.xhp">Changing Default Attributes</topic>
<topic id="smath/text/smath/guide/brackets.xhp">Merging Formula Parts in Brackets</topic>
<topic id="smath/text/smath/guide/comment.xhp">Entering Comments</topic>
<topic id="smath/text/smath/guide/newline.xhp">Entering Line Breaks</topic>
<topic id="smath/text/smath/guide/parentheses.xhp">Inserting Brackets</topic>
		</node>
	</help_section>
</tree_view>