<div dir="ltr">Sorry, one more question<br><br>
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<p style="margin: 0px; text-indent: 0px;">\documentclass{article}</p>
<p style="margin: 0px; text-indent: 0px;">\newif\iffirst</p>
<p style="margin: 0px; text-indent: 0px;">\newif\ifsecond</p>
<p style="margin: 0px; text-indent: 0px;">\firsttrue</p>
<p style="margin: 0px; text-indent: 0px;">\newcommand{\printtest}{%</p>
<p style="margin: 0px; text-indent: 0px;">\csname iffirst\expandafter\endcsname\csname ifsecond\endcsname TT\else TF\fi\else\csname ifsecond\endcsname FT\else FF\fi\fi</p>
<p style="margin: 0px; text-indent: 0px;">}</p>
<p style="margin: 0px; text-indent: 0px;">\begin{document}</p>
<p style="margin: 0px; text-indent: 0px;">\printtest</p>
<p style="margin: 0px; text-indent: 0px;">\end{document}</p><p style="margin: 0px; text-indent: 0px;"><br></p><p style="margin: 0px; text-indent: 0px;">Tex again complains about an extra \fi.<br></p><br></div>