Hier ein Beispiel:
\documentclass[a4paper, 12pt, twoside]{scrreprt}
\usepackage[greek,ngerman]{babel}
\languageattribute{greek}{polutoniko}
\usepackage{yfonts}
\usepackage{array}
\usepackage{marvosym}
\usepackage{tikz}
\usepackage{stmaryrd}
\usepackage{amsmath}
\usepackage{xspace}
%\usepackage{ifsym}
\usepackage{ngerman}
\usepackage{parallel, lineno}
\usepackage{fancyhdr}
\usepackage{amssymb}
\usepackage{wasysym}
\usepackage{tipa}
\usepackage{txfonts}
\usepackage{graphics}
\usepackage{graphicx}
\usepackage{rotating}
%\usepackage{wrapfig}
%\usepackage{picins}
%\usepackage{picinpar,graphicx}
\usepackage{url}
\usepackage{textcomp}
\usepackage{supertabular}
%\usepackage{mathabx}
%\usepackage{latexsym}
%\usepackage{alltt}
\usepackage[utf8]{inputenc}
\inputencoding{latin1}
\usepackage{multicol, ragged2e}
%\usepackage{floatflt}
\usepackage[fit]{truncate}
\usepackage{parallel,lineno}
\usepackage{etex}
\usepackage[T1]{fontenc}
\usepackage[perpage]{footmisc}
\newcommand\aer{\raise-0.1ex\hbox{\rotatebox{90}{$\otop$}}\xspace}
\begin{document}
\LR{non\aer{}eae, nec igneae,}
{weder Luft noch Feuer}
\end{document}
Folgende Fehlermeldung kommt: ! Undefined control sequence.
<recently read> \otop
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., \hobx'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
Ich denke, dass der Befehl \otop nicht erkannt wird, finde aber keine Lösung..