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+%%
+%% An UIT Edition example
+%%
+%% Example 06-15-2 on page 117.
+%%
+%% Copyright (C) 2010 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+\documentclass[]{exaartplain}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\usepackage[utf8]{inputenc}
+\usepackage{lmodern}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\makeatletter
+\newcommand\xLongLeftRightArrow[2][]{\ext@arrow 0055{\LongLeftRightArrowfill@}{#1}{#2}}
+\def\LongLeftRightArrowfill@{\arrowfill@\Leftarrow\Relbar\Rightarrow}
+\newcommand\xlongleftrightarrow[2][]{\ext@arrow 0055{\longleftrightarrowfill@}{#1}{#2}}
+\def\longleftrightarrowfill@{\arrowfill@\leftarrow\relbar\rightarrow}
+\makeatother
+\StopShownPreambleCommands
+\begin{document}
+$\Leftarrow\Relbar\Rightarrow$
+$\Leftarrow\mkern-3mu\Relbar\mkern-3mu\Rightarrow$
+$\xLongLeftRightArrow[\text{UUU}]{\text{OOOOOOO}}$
+$\xlongleftrightarrow[y=f(x,v,w)]{x=f(w)}$
+\end{document}