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\def\av{{\sf avm.sty}}
\def\AVM{\small AVM}
\avmfont{\sc}
\avmsortfont{\scriptsize\it}
\def\ssf{\small\sf}

% This was used in trees to make the tree skips bigger and the avm skips
% smaller.
\def\avmtreeparms{\avmvskip{.1ex}\avmhskip{.5em}%
\avmbskip{-.2em}\daughterskip=4ex\sisterskip=3em}

%chris+
% The \ex definition
%   modified Feb 13 1991 to provide \exn for bare example number,
%   \ex for normal xref format, in parentheses.
% further modified to have (following) optional argument for sublabel
% beware if you follow it by a square bracket for other reasons!
%\newcounter{tempcnt}

% this one doesn't gobble spaces while looking for a [ and so will leave a
% space after an optional argument.
\def\@ifverynextchar#1#2#3{\let\@tempe #1\def\@tempa{#2}\def
        \@tempb{#3}\futurelet\@tempc\@ifvnch}
\def\@ifvnch{\ifx \@tempc \@tempe\let\@tempd\@tempa\else\let\@tempd\@tempb\fi
        \@tempd}

\newcommand{\exn}[1]{\setcounter{tempcnt}{\value{enums}}%
\addtocounter{tempcnt}{#1}%
\arabic{tempcnt}}

\def\@ex#1[#2]{(\exn{#1}#2)}

\def\ex#1{\@ifverynextchar[{\@ex#1}% %]
{\@ex#1[]}}

\def\exx#1#2{(\exn{#1}--\exn{#2})}

\def\exxref#1#2{(\ref{#1}--\ref{#2})}

%  \exref for label-references: (ADA 13 Feb 1991)
\def\exref#1{\@ifverynextchar[{\@exref#1}% %]
{\@exref#1[]}}

\def\@exref#1[#2]{(\ref{#1}#2)}
%chris-



% taken from Chris's personal macros
%chris+
% Examples environment.  This is a slightly non-standard environment that
% has two optional parameters:
% o the first is a number or other label to give the example.  This
%   optional argument must be surrounded in ( ); if none is supplied the
%   enums counter is used; either will be surrounded by ( ) in the text.
% o the second is a string representing the longest piece of text you
%   allege you will want to llap with \bad below and the indentation of
%   examples is increased by the width of it to allow for this.
% (Note that LaTeX doesn't officially support optional arguments to
% environments, and having two kinds of optional arguments is a bit of an
% innovation, but they're not difficult to implement in practice.)
% Examples:
%   A complete example:
%     \begin{examples}(18)[\#\#] \item \bad{\#\#}A bone ate a dog.
%                                \item A dog ate a bone.    \end{examples}
%   Other prologues:
%     \begin{examples} (92)    \begin{examples}[??]    \begin{examples}
\newbox\ll@pbox      % for calculating width of llap'ed material
\newdimen\llapdimen
\llapdimen=0pt
\newdimen\exlabel
\exlabel=20pt

\def\bad#1{\leavevmode\llap{#1}}        % put badness ratings in here!

% these clauses provide a definition of the `examples' pseudo-environment
\def\examples{\@ifnextchar({\ex@@mples}% %)
{\refstepcounter{enums}\ex@@mples(\theenums)}}

\long\def\ex@@mples(#1){\@ifnextchar[{\ex@mples(#1)}% %]
{\ex@mples(#1)[]}}

\long\def\ex@mples(#1)[#2]{\def\eelabel{#1}
\setbox\@tempboxa=\hbox{(#1)}%There used to be a space here which was crazy
\@tempdima=\wd\@tempboxa
\ifdim\exlabel&gt;\@tempdima \@tempdima=\exlabel\fi
%\advance\@tempdima by -20pt
\setbox\ll@pbox=\hbox{#2}
\@tempdimb=\wd\ll@pbox
\ifdim\llapdimen&gt;\@tempdimb \@tempdimb=\llapdimen\fi
\begin{list}{\alph{enumsi}.}{\usecounter{enumsi}%
% abandon auto width determination until I can get it right...
%\labelwidth=\@tempdima\leftmargin=\@tempdima
\advance\leftmargin by \eeindent\advance\labelwidth by \eeindent
\advance\leftmargin by \@tempdimb\advance\labelsep by \@tempdimb
\advance\leftmargin by\widelabel \advance\labelwidth by \widelabel
%\itemsep=0pt  % Optional, but sometimes examples look better scrunched a bit
\let\makelabel=\enummakelabel}}

\def\endexamples{\end{list}}

% example environment
\def\example{\@ifnextchar({\ex@@mple}% %)
{\refstepcounter{enums}\ex@@mple(\theenums)}}

\long\def\ex@@mple(#1){\@ifnextchar[{\ex@mple(#1)}% %]
{\ex@mple(#1)[]}}

\long\def\ex@mple(#1)[#2]{\setbox\ll@pbox=\hbox{#2}%
\begin{list}{}{\advance\leftmargin by \wd\ll@pbox%
\advance\leftmargin by\widelabel \advance\labelwidth by\widelabel
\advance\labelsep by \wd\ll@pbox} 
\item[(#1)]}

\def\endexample{\end{list}}
%chris-
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