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Some fascinating behaviours manifested here :<br>
<br>
<blockquote type="cite"> <tt>\font\OTtenrm="[lmroman10-regular.otf]/OT"</tt><tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\font \noto = "Noto Serif"</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\chardef \rtl "002F</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\chardef \ltr "002E</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\TeXXeTstate = 1</tt></p>
</blockquote>
<blockquote type="cite"><tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\beginR</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> abc
\ltr def \rtl ghi \ltr jkl \rtl mno</tt></p>
</blockquote>
<blockquote type="cite"><tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\beginR</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\OTtenrm</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> abc
\ltr def \rtl ghi \ltr jkl \rtl mno</tt></p>
</blockquote>
<blockquote type="cite"><tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"> </p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\beginR</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\noto</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt> abc
\ltr def \rtl ghi \ltr jkl \rtl mno</tt></p>
<tt>
</tt>
<p style="-qt-paragraph-type:empty; margin-top:0px;
margin-bottom:0px; margin-left:0px; margin-right:0px;
-qt-block-indent:0; text-indent:0px;"><tt><br>
</tt></p>
<tt>
</tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><tt>
\end</tt></p>
</blockquote>
** P.<br>
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