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+%% This is part of OpTeX project, see http://petr.olsak.net/optex
+
+\fontfam[LMfonts]              % Default font family: Latin Modern
+
+\margins/1 a5 (1,1,1,1.4)cm    % A5 paper + 1cm margins
+\typosize[9/10.5]              % 9pt font / 10.5pt baselineskip
+\parindent=10pt                % typesetting parameters
+\hyperlinks \Blue\Blue         % active hyperlinks
+\activettchar`                 % in-text verbatim by `...`
+\everyintt={\Red}              % in-text verbatim Red
+\enquotes                      % use \"text" for English quotation  
+
+\tit Demonstration
+
+\nonum\notoc\sec Contents
+
+\maketoc  % Table of Contents is auto-generated here
+
+\sec Lists
+
+The lists have to be surrounded by `\begitems`
+and `\enditems` sequences.
+
+\begitems
+* First item.
+* Second item.
+  \begitems \style i
+    * Nested item list,
+    * numbered by roman numerals.
+  \enditems
+* Last item.
+\enditems
+
+\secc Title of\nl Subsection
+
+The subsection text\dots
+
+\sec References
+
+There is a numbered equation. 
+The number is auto-generated by `\eqmark` sequence.
+$$\label[my-eq]
+  a^2 + b^2 = c^2  \eqmark
+$$
+We can refer to Equation~\ref[my-eq]
+on page~\pgref[my-eq].
+We can refer to Table~\ref[my-tab] in
+Section~\ref[tab-sec] too. And Figure~\ref[my-pic]
+is on page~\pgref[my-pic].
+
+\sec Hyperlinks
+
+You can refer to \url{http://petr.olsak.net} using `\url`.
+Or use `\ulink` if the raw URL needs to be hidden:
+\ulink[http://petr.olsak.net/optex]{\OpTeX/ page}.
+The parameter text is colorized and it becomes 
+an active link if the `\hyperlinks` sequence
+is used at the beginning of the document.
+Internal links are activated too.
+
+\sec[tab-sec] Tables 
+
+The `\table` sequence can be used 
+instead of \"low level" `\halign`.
+The following table is framed by `\frame` sequence 
+in order to get a double frame.
+
+\bigskip
+\caption/t [my-tab]  Testing table.
+\cskip
+\centerline{%
+   \frame{\table{|r|c|l|}{\crl
+           \bf Title A & \bf Title B & \bf Title C \crll
+           first & second & third \cr
+           next  & text  & last  \crl }}}
+
+\sec Images
+
+The images (PDF, JPG, PNG, TIFF) can be inserted 
+by `\inspic` sequence. The `\caption` 
+can be added if you need to refer to a figure.
+
+\label[my-pic]
+\centerline {\picwidth=2.7cm \inspic{op-ring.png}}
+\cskip
+\caption/f The nonempty ideal of a simple ring --
+           the ring itself.
+
+\sec Verbatim
+
+In-text verbatim is surrounded by the character declared
+by `\activettchar` sequence. The listing can be surrounded
+by `\begtt` and `\endtt` sequences
+\begtt
+This is verbatim.
+  All characters are printed $$, \, # etc.
+\endtt
+or it can be included by `\verbinput` from external file.
+
+\verbinput (98-100) op-demo.tex
+
+\sec Math
+
+The Math alphabets
+`\mit`, `\cal`, `\script`, `\frak`, `\bbchar`, `\bi`
+are provided. For example:
+$$
+  {\bi A} = \pmatrix {\cal C  & \script C \cr
+                      \frak M & \bbchar R }.  
+$$
+Hundreds of AMS symbols are available:
+$\sphericalangle, \boxplus, \Cup, \Cap, \ldots$
+
+\sec Others
+
+The `\fontfam` command selects a desired family of fonts.
+The `\typosize` or `\typoscale` sequences set the size
+and baselineskip of used fonts (including math fonts).
+The `\fnote` generates a footnote\fnote{Like this} and
+`\mnote` generates a margin note. 
+The `\margins` sets margins and paper dimensions.
+The `\cite` sequence can be used for bibliographic citations.
+The `\bib` sequence creates one bibliography record. Or 
+you can use `\usebib` for direct access to the {\tt.bib} files. 
+The list of features does not end here\dots
+
+\bye