../data/SS09/extarrows.sty (download)
\NeedsTeXFormat{LaTeX2e} \ProvidesPackage{ccc-arrows}[2002/03/30 v1.0a ccc: Extensible Arrows] \RequirePackage{amsmath} \def\x@arrow{\DOTSB\Relbar} \def\xlongequalsignfill@{\arrowfill@\x@arrow\Relbar\x@arrow} \newcommand{\xlongequal}[2][]{% \ext@arrow 0099\xlongequalsignfill@{#1}{#2}} \def\xLongleftrightarrowfill@{% \arrowfill@\Longleftarrow\Relbar\Longrightarrow} \newcommand{\xLongleftrightarrow}[2][]{% \ext@arrow 0099\xLongleftrightarrowfill@{#1}{#2}} \def\xlongleftrightarrowfill@{% \arrowfill@\longleftarrow\relbar\longrightarrow} \newcommand{\xlongleftrightarrow}[2][]{% \ext@arrow 0099\xlongleftrightarrowfill@{#1}{#2}} \def\xLeftrightarrowfill@{\arrowfill@\Leftarrow\Relbar\Rightarrow} \newcommand{\xLeftrightarrow}[2][]{% \ext@arrow 0099\xLeftrightarrowfill@{#1}{#2}} \def\xleftrightarrowfill@{\arrowfill@\leftarrow\relbar\rightarrow} \newcommand{\xleftrightarrow}[2][]{% \ext@arrow 0099\xleftrightarrowfill@{#1}{#2}} \def\xLongleftarrowfill@{\arrowfill@\Longleftarrow\Relbar\Relbar} \newcommand{\xLongleftarrow}[2][]{% \ext@arrow 0099\xLongleftarrowfill@{#1}{#2}} \def\xLongrightarrowfill@{\arrowfill@\Relbar\Relbar\Longrightarrow} \newcommand{\xLongrightarrow}[2][]{% \ext@arrow 0099\xLongrightarrowfill@{#1}{#2}} \def\xlongleftarrowfill@{\arrowfill@\longleftarrow\relbar\relbar} \newcommand{\xlongleftarrow}[2][]{% \ext@arrow 0099\xlongleftarrowfill@{#1}{#2}} \def\xlongrightarrowfill@{\arrowfill@\relbar\relbar\longrightarrow} \newcommand{\xlongrightarrow}[2][]{% \ext@arrow 0099\xlongrightarrowfill@{#1}{#2}} \endinput