% ACMCONF DOCUMENT STYLE
%    adapted from ARTICLE document style by Ken Traub
% ARTICLE DOCUMENT STYLE -- Released 16 March 1988
%    for LaTeX version 2.09
% Copyright (C) 1988 by Leslie Lamport

%%% ACMCONF is a document style for producing two-column camera-ready pages for
%%% ACM conferences, according to ACM specifications.  The main features of
%%% this style are:
%%% 
%%% 1)  Two columns.
%%% 2)  Side and top margins of 4.5pc, bottom margin of 7.5pc, column gutter of
%%%     2pc, hence columns are 20pc wide and 54pc tall.  (6pc = 1in, approx)
%%% 3)  First page has title information, and an extra 4.5pc of space at the
%%%     bottom of the first column for the ACM copyright notice.
%%% 4)  Text is 9pt on 10pt baselines; titles are 9pt bold sans-serif.
%%% 
%%% There are a few restrictions you must observe:
%%% 
%%% 1)  You cannot change the font size; ACM wants you to use 9pt.
%%% 2)  There are no page numbers; ACM will number the pages for you (you
%%%     should put page numbers on the BACK of each page, though, in case
%%%     someone drops your paper on the floor.
%%% 3)  You must start your paper with the \maketitle command.  Prior to the
%%%     \maketitle you must have \title and \author commands.  If you have a
%%%     \date command it will be ignored; no date appears on the paper, since
%%%     the proceedings will have a date on the front cover.
%%% 4)  Marginal paragraphs, tables of contents, lists of figures and tables,
%%%     and page headings are all forbidden.
%%% 5)  The `figure' environment will produce a figure one column wide; if you
%%%     want one that is two columns wide, use `figure*'.

\typeout{Document Style `acmconf' <22 May 89>.}
\typeout{Bugs to KT@MC.LCS.MIT.EDU}

\newif\if@acmconf\@acmconftrue
\long\def\ifacmconf#1#2{\if@acmconf#1\else#2\fi}

\@namedef{ds@10pt}{\@latexerr{The `10pt' option is not allowed in the `acmconf'
  document style.}\@eha}
\@namedef{ds@11pt}{\@latexerr{The `11pt' option is not allowed in the `acmconf'
  document style.}\@eha}
\@namedef{ds@12pt}{\@latexerr{The `12pt' option is not allowed in the `acmconf'
  document style.}\@eha}

\@options

\def\affiliation#1{\gdef\@affiliation{#1}}
\def\address#1{\gdef\@address{#1}}

\lineskip 1pt            % \lineskip is 1pt for all font sizes.
\normallineskip 1pt
\def\baselinestretch{1}

\def\@normalsize{\@setsize\normalsize{10pt}\ixpt\@ixpt
\abovedisplayskip 9pt plus2pt minus4.5pt%
\belowdisplayskip \abovedisplayskip
\abovedisplayshortskip  \z@ plus3pt%   
\belowdisplayshortskip  5.4pt plus3pt minus3pt%
\let\@listi\@listI}   % Setting of \@listi added 9 Jun 87

\def\small{\@setsize\small{9pt}\viiipt\@viiipt
\abovedisplayskip 7.6pt plus 3pt minus 4pt%
\belowdisplayskip \abovedisplayskip
\abovedisplayshortskip \z@ plus2pt%
\belowdisplayshortskip 3.6pt plus2pt minus 2pt
\def\@listi{\leftmargin\leftmargini %% Added 22 Dec 87
\topsep 4pt plus 2pt minus 2pt\parsep 2pt plus 1pt minus 1pt
\itemsep \parsep}}

\def\footnotesize{\@setsize\footnotesize{8pt}\viipt\@viipt
\abovedisplayskip 6.4pt plus 2pt minus 4pt%
\belowdisplayskip \abovedisplayskip
\abovedisplayshortskip \z@ plus 1pt%
\belowdisplayshortskip 2.7pt plus 1pt minus 2pt
\def\@listi{\leftmargin\leftmargini %% Added 22 Dec 87
\topsep 3pt plus 1pt minus 1pt\parsep 2pt plus 1pt minus 1pt
\itemsep \parsep}}

\def\scriptsize{\@setsize\scriptsize{8pt}\viipt\@viipt}
\def\tiny{\@setsize\tiny{6pt}\vpt\@vpt}
\def\large{\@setsize\large{13.6pt}\xipt\@xipt}
\def\Large{\@setsize\Large{14pt}\xiipt\@xiipt}
\def\LARGE{\@setsize\LARGE{18pt}\xivpt\@xivpt}
\def\huge{\@setsize\huge{22pt}\xviipt\@xviipt}
\def\Huge{\@setsize\Huge{25pt}\xxpt\@xxpt}

% changed DSE 4/21/90, couldn't find cmssbx10 font !
%\font\ninsfb = cmssbx10\@ptscale9
%\def\@acmtitlestyle{\normalsize\ninsfb}
% \font\ninsfb = cmss10\@ptscale9
%\def\@acmtitlestyle{\normalsize\sf\bf}
\def\@acmtitlestyle{\large\sf\bf}          % SNS: Make titles bigger.

\normalsize  % Choose the normalsize font.

\oddsidemargin 4.5pc
\evensidemargin 4.5pc
\advance\oddsidemargin by -1in	  % Correct for LaTeX gratuitousness
\advance\evensidemargin by -1in   % Correct for LaTeX gratuitousness
\marginparwidth 0pt         % Margin pars are not allowed.
\marginparsep 11pt          % Horizontal space between outer margin and 
                            % marginal note

                         % Top of page:
\topmargin 4.5pc         %    Nominal distance from top of page to top of
                         %    box containing running head.
\advance\topmargin by -1in  % Correct for LaTeX gratuitousness
\headheight 0pt          %    Height of box containing running head.
\headsep 0pt             %    Space between running head and text.
                         % Bottom of page:
%%\footskip 30pt           %    Distance from baseline of box containing foot 
                         %    to baseline of last line of text.
\footskip 10pt           %    Distance from baseline of box containing foot 
                         %    to baseline of last line of text.

%%%%%%%%%%%%%%%%%%%%\textheight 650pt
% \textheight 675pt
\textheight 670pt
\textwidth 42pc          % Width of text line.
                         % For two-column mode: 
\columnsep 2pc           %    Space between columns 
\columnseprule 0pt       %    Width of rule between columns.
\hfuzz 1pt               % Allow some variation in column width, otherwise it's
		         % too hard to typeset in narrow columns.

\footnotesep 5.6pt    % Height of strut placed at the beginning of every
                      % footnote = height of normal \footnotesize strut,
                      % so no extra space between footnotes.

\skip\footins 8.1pt plus 4pt minus 2pt % Space between last line of text and 

                                       % top of first footnote.
\floatsep 11pt plus 2pt minus 2pt        % Space between adjacent floats moved
                                         % to top or bottom of text page.
\textfloatsep 18pt plus 2pt minus 4pt    % Space between main text and floats
                                         % at top or bottom of page.
\intextsep 11pt plus 2pt minus 2pt       % Space between in-text figures and 
                                         % text.
\@maxsep 18pt                            % The maximum of \floatsep, 
                                         % \textfloatsep and \intextsep (minus
                                         % the stretch and shrink).
\dblfloatsep 11pt plus 2pt minus 2pt     % Same as \floatsep for double-column
                                         % figures in two-column mode.
\dbltextfloatsep 18pt plus 2pt minus 4pt % \textfloatsep for double-column 
                                         % floats.
\@dblmaxsep 18pt                         % The maximum of \dblfloatsep and 
                                         % \dbltexfloatsep.
\@fptop 0pt plus 1fil    % Stretch at top of float page/column. (Must be    
                         % 0pt plus ...)                                    
\@fpsep 8pt plus 2fil    % Space between floats on float page/column.       
\@fpbot 0pt plus 1fil    % Stretch at bottom of float page/column. (Must be 
                         % 0pt plus ... )                                   
\@dblfptop 0pt plus 1fil % Stretch at top of float page. (Must be 0pt plus ...)
\@dblfpsep 8pt plus 2fil % Space between floats on float page.
\@dblfpbot 0pt plus 1fil % Stretch at bottom of float page. (Must be 
                         % 0pt plus ... )                                   
\marginparpush 5pt       % Minimum vertical separation between two marginal 
                         % notes.

\parskip 0pt plus 1pt              % Extra vertical space between paragraphs.
\parindent 13.5pt                  % Width of paragraph indentation.
%\topsep 8pt plus 2pt minus 4pt    % Extra vertical space, in addition to 
                                   % \parskip, added above and below list and
                                   % paragraphing environments.
\partopsep 2pt plus 1pt minus 1pt  % Extra vertical space, in addition to 
                                   % \parskip and \topsep, added when user
                                   % leaves blank line before environment.
%\itemsep 4pt plus 2pt minus 1pt   % Extra vertical space, in addition to
                                   % \parskip, added between list items.
% See \@listI for values of \topsep and \itemsep

\@lowpenalty   51      % Produced by \nopagebreak[1] or \nolinebreak[1]
\@medpenalty  151      % Produced by \nopagebreak[2] or \nolinebreak[2]
\@highpenalty 301      % Produced by \nopagebreak[3] or \nolinebreak[3]

\@beginparpenalty -\@lowpenalty    % Before a list or paragraph environment.
\@endparpenalty   -\@lowpenalty    % After a list or paragraph environment.
\@itempenalty     -\@lowpenalty    % Between list items.

% \clubpenalty         % 'Club line'  at bottom of page.
% \widowpenalty        % 'Widow line' at top of page.
% \displaywidowpenalty % Math display widow line.
% \predisplaypenalty   % Breaking before a math display.
% \postdisplaypenalty  % Breaking after a math display.
% \interlinepenalty    % Breaking at a line within a paragraph.
% \brokenpenalty       % Breaking after a hyphenated line.

\def\part{\par               % New paragraph
   \addvspace{4ex}           % Adds vertical space above title.
   \@afterindentfalse        % Suppresses indent in first paragraph.  Change
   \secdef\@part\@spart}     % to \@afterindenttrue to have indent.

\def\@part[#1]#2{\ifnum \c@secnumdepth >\m@ne    % IF secnumdepth > -1
        \refstepcounter{part}                    %  THEN step part counter
        \addcontentsline{toc}{part}{\thepart     %       add toc line
        \hspace{1em}#1}\else                     %  ELSE add unnumbered line
      \addcontentsline{toc}{part}{#1}\fi         % FI
   { \parindent 0pt \raggedright 
    \ifnum \c@secnumdepth >\m@ne   % IF secnumdepth > -1 
      \Large \bf Part \thepart     %   THEN Print 'Part' and 
      \par \nobreak                %          number in \Large boldface.
    \fi                            % FI
    \huge \bf                      % Select \huge boldface.
    #2\markboth{}{}\par }          % Print title and set heading marks null.
    \nobreak                       % TeX penalty to prevent page break.
    \vskip 3ex                     % Space between title and text.
   \@afterheading                  % Routine called after part and
    }                              %     section heading.

\def\@spart#1{{\parindent 0pt \raggedright 
    \huge \bf                       
    #1\par}                         % Title.
    \nobreak                        % TeX penalty to prevent page break.
    \vskip 3ex                      % Space between title and text.
    \@afterheading                  % Routine called after part and
  }                                 %     section heading.

\def\section{\@startsection {section}{1}{\z@}{-3.5ex plus -1ex minus 
    -.2ex}{2.3ex plus .2ex}{\@acmtitlestyle}}
\def\subsection{\@startsection{subsection}{2}{\z@}{-3.25ex plus -1ex minus 
   -.2ex}{1.5ex plus .2ex}{\@acmtitlestyle}}
\def\subsubsection{\@startsection{subsubsection}{3}{\z@}{-3.25ex plus 
-1ex minus -.2ex}{1.5ex plus .2ex}{\@acmtitlestyle}}
\def\paragraph{\@startsection
     {paragraph}{4}{\z@}{3.25ex plus 1ex minus .2ex}{-1em}{\@acmtitlestyle}}
\def\subparagraph{\@startsection
     {subparagraph}{4}{\parindent}{3.25ex plus 1ex minus 
     .2ex}{-1em}{\@acmtitlestyle}}

\setcounter{secnumdepth}{3}

\def\appendix{\par
  \setcounter{section}{0}
  \setcounter{subsection}{0}
  \def\thesection{\Alph{section}}}

\leftmargini 22.5pt
\leftmarginii 19.8pt     % > \labelsep + width of '(m)'
\leftmarginiii 16.8pt  % > \labelsep + width of 'vii.'
\leftmarginiv 15.3pt     % > \labelsep + width of 'M.'
\leftmarginv 9pt
\leftmarginvi 9pt

\leftmargin\leftmargini
\labelsep 4.5pt
\labelwidth\leftmargini\advance\labelwidth-\labelsep
% \parsep 4pt plus 2pt minus 1pt (Removed 9 Jun 87)

% \@listI defines top level and \@listi values of
% \leftmargin, \topsep, \parsep, and \itemsep
% (Added 9 Jun 87)
\def\@listI{\leftmargin\leftmargini \parsep 3.6pt plus 2pt minus 1pt%
\topsep 7.2pt plus 2pt minus 4pt%
\itemsep 3.6pt plus 2pt minus 1pt}

\let\@listi\@listI
\@listi 

\def\@listii{\leftmargin\leftmarginii
   \labelwidth\leftmarginii\advance\labelwidth-\labelsep
   \topsep 3.6pt plus 2pt minus 1pt
   \parsep 1.8pt plus 0.9pt minus 0.9pt
   \itemsep \parsep}

\def\@listiii{\leftmargin\leftmarginiii
    \labelwidth\leftmarginiii\advance\labelwidth-\labelsep
    \topsep 1.8pt plus 0.9pt minus 0.9pt 
    \parsep \z@ \partopsep 1pt plus 0pt minus 1pt
    \itemsep \topsep}

\def\@listiv{\leftmargin\leftmarginiv
     \labelwidth\leftmarginiv\advance\labelwidth-\labelsep}

\def\@listv{\leftmargin\leftmarginv
     \labelwidth\leftmarginv\advance\labelwidth-\labelsep}

\def\@listvi{\leftmargin\leftmarginvi
     \labelwidth\leftmarginvi\advance\labelwidth-\labelsep}

\def\labelenumi{\theenumi.}    
\def\theenumi{\arabic{enumi}}     
 
\def\labelenumii{(\theenumii)}
\def\theenumii{\alph{enumii}}
\def\p@enumii{\theenumi}

\def\labelenumiii{\theenumiii.}
\def\theenumiii{\roman{enumiii}}
\def\p@enumiii{\theenumi(\theenumii)}

\def\labelenumiv{\theenumiv.}
\def\theenumiv{\Alph{enumiv}}     
\def\p@enumiv{\p@enumiii\theenumiii}

\def\labelitemi{$\bullet$}
\def\labelitemii{\bf --}
\def\labelitemiii{$\ast$}
\def\labelitemiv{$\cdot$}

\def\verse{\let\\=\@centercr  
  \list{}{\itemsep\z@ \itemindent -1.5em\listparindent \itemindent 
          \rightmargin\leftmargin\advance\leftmargin 1.5em}\item[]}
\let\endverse\endlist

\def\quotation{\list{}{\listparindent 1.5em
    \itemindent\listparindent
    \rightmargin\leftmargin \parsep 0pt plus 1pt}\item[]}
\let\endquotation=\endlist

\def\quote{\list{}{\rightmargin\leftmargin}\item[]}
\let\endquote=\endlist

%\def\descriptionlabel#1{\hspace\labelsep \bf #1}
%\def\description{\list{}{\labelwidth\z@ \itemindent-\leftmargin
%       \let\makelabel\descriptionlabel}}

%\let\enddescription\endlist

\def\descriptionlabel#1{\hspace\labelsep #1}
\def\description
{
  \list{}
  {
    \labelwidth\z@ 
    \itemindent-\leftmargin
    \parsep 1pt
    \itemsep 1pt
    \let\makelabel\descriptionlabel
  }
}

\let\enddescription\endlist

%\newdimen\descriptionmargin
%\descriptionmargin=3em

\def\theequation{\arabic{equation}}

% \jot = 3pt      % Extra space added between lines of an eqnarray environment

% The macro \@eqnnum defines how equation numbers are to appear in equations.
%
% \def\@eqnnum{(\theequation)} 
% 

\def\titlepage{\@restonecolfalse\if@twocolumn\@restonecoltrue\onecolumn
     \else \newpage \fi \thispagestyle{empty}\c@page\z@}

\def\endtitlepage{\if@restonecol\twocolumn \else \newpage \fi}

\arraycolsep 4.5pt     % Half the space between columns in an array
		       % environment. 
\tabcolsep 5.4pt       % Half the space between columns in a
		       % tabularenvironment. 
\arrayrulewidth .4pt % Width of rules in array and tabular environment.
\doublerulesep 1.8pt   % Space between adjacent rules in array or tabular env.

\tabbingsep \labelsep   % Space used by the \' command.  (See LaTeX manual.)

\skip\@mpfootins = \skip\footins

\fboxsep = 2.7pt    % Space left between box and text by \fbox and \framebox.
\fboxrule = .4pt  % Width of rules in box made by \fbox and \framebox.

\newcounter{part}
\newcounter {section}
\newcounter {subsection}[section]
\newcounter {subsubsection}[subsection]
\newcounter {paragraph}[subsubsection]
\newcounter {subparagraph}[paragraph]

\def\thepart{\Roman{part}} % Roman numeral part numbers.
\def\thesection       {\arabic{section}}
\def\thesubsection    {\thesection.\arabic{subsection}}
\def\thesubsubsection {\thesubsection .\arabic{subsubsection}}
\def\theparagraph     {\thesubsubsection.\arabic{paragraph}}
\def\thesubparagraph  {\theparagraph.\arabic{subparagraph}}

\def\@pnumwidth{1.55em}
\def\@tocrmarg {2.55em}
\def\@dotsep{4.5}
\setcounter{tocdepth}{3}

\def\tableofcontents{\@latexerr{\tableofcontents: Tables of contents are not
  allowed in the `acmconf' document style.}\@eha}

\def\l@part#1#2{\addpenalty{\@secpenalty}
   \addvspace{2.25em plus 1pt}  % space above part line
   \begingroup
   \@tempdima 3em         % width of box holding part number, used by 
     \parindent \z@ \rightskip \@pnumwidth             %% \numberline
     \parfillskip -\@pnumwidth   
     {\large \bf          % set line in \large boldface
     \leavevmode          % TeX command to enter horizontal mode.       
     #1\hfil \hbox to\@pnumwidth{\hss #2}}\par
     \nobreak             % Never break after part entry
   \endgroup}

\def\l@section#1#2{\addpenalty{\@secpenalty}  % good place for page break
   \addvspace{1.0em plus 1pt}  % space above toc entry
   \@tempdima 1.5em            % width of box holding section number
   \begingroup
     \parindent \z@ \rightskip \@pnumwidth 
     \parfillskip -\@pnumwidth   
     \bf                  % Boldface.
     \leavevmode          % TeX command to enter horizontal mode.       
      \advance\leftskip\@tempdima  %% added 5 Feb 88 to conform to 
      \hskip -\leftskip            %% 25 Jan 88 change to \numberline
     #1\nobreak\hfil \nobreak\hbox to\@pnumwidth{\hss #2}\par
   \endgroup}


\def\l@section#1#2{\addpenalty{\@secpenalty} \addvspace{1.0em plus 1pt}
\@tempdima 1.5em \begingroup
 \parindent \z@ \rightskip \@pnumwidth 
 \parfillskip -\@pnumwidth 
 \bf \leavevmode \advance\leftskip\@tempdima \hskip -\leftskip #1\nobreak\hfil
\nobreak\hbox to\@pnumwidth{\hss #2}\par
 \endgroup}

      
\def\l@subsection{\@dottedtocline{2}{1.5em}{2.3em}}
\def\l@subsubsection{\@dottedtocline{3}{3.8em}{3.2em}}
\def\l@paragraph{\@dottedtocline{4}{7.0em}{4.1em}}
\def\l@subparagraph{\@dottedtocline{5}{10em}{5em}}

\def\listoffigures{\@latexerr{\listoffigures: Lists of figures are not
  allowed in the `acmconf' document style.}\@eha}

\def\l@figure{\@dottedtocline{1}{1.5em}{2.3em}}

\def\listoftables{\@latexerr{\listoftables: Lists of tables are not
  allowed in the `acmconf' document style.}\@eha}
\let\l@table\l@figure


%\def\thebibliography#1{\section*{References\@mkboth
%  {REFERENCES}{REFERENCES}}\list
%  {[\arabic{enumi}]}{\settowidth\labelwidth{[#1]}\leftmargin\labelwidth
%    \advance\leftmargin\labelsep
%    \usecounter{enumi}}
%    \def\newblock{\hskip .11em plus .33em minus .07em}
%    \sloppy\clubpenalty4000\widowpenalty4000
%    \sfcode`\.=1000\relax}

\def\thebibliography#1{
  \section*{REFERENCES}
  \list
    {[\arabic{enumi}]}
    {\settowidth\labelwidth{[#1]}
     \leftmargin\labelwidth
     \parsep 2pt
     \itemsep 2pt
     \advance\leftmargin\labelsep
     \usecounter{enumi}
    }
  \def\newblock{\hskip .11em plus .33em minus .07em}
  \sloppy\clubpenalty10000\widowpenalty10000
  \sfcode`\.=1000\relax
}

\let\endthebibliography=\endlist

% \def\@biblabel#1{[#1]\hfill}  % Produces the label for a \bibitem[...]
                                % command. 
% \def\@cite#1{[#1]}            % Produces the output of the \cite command.

\newif\if@restonecol

\def\theindex{\@restonecoltrue\if@twocolumn\@restonecolfalse\fi
\columnseprule \z@
\columnsep 35pt\twocolumn[\section*{Index}]
    \@mkboth{INDEX}{INDEX}\thispagestyle{empty}\parindent\z@
    \parskip\z@ plus .3pt\relax\let\item\@idxitem}

\def\@idxitem{\par\hangindent 40pt}

\def\subitem{\par\hangindent 40pt \hspace*{20pt}}

\def\subsubitem{\par\hangindent 40pt \hspace*{30pt}}

\def\endtheindex{\if@restonecol\onecolumn\else\clearpage\fi}

\def\indexspace{\par \vskip 10pt plus 5pt minus 3pt\relax}

\def\footnoterule{\kern-3\p@   
  \hrule width .4\columnwidth 
  \kern 2.6\p@}                 % The \hrule has default height of .4pt .

\long\def\@makefntext#1{\parindent 1em\noindent 
            \hbox to 1.8em{\hss$^{\@thefnmark}$}#1}

\setcounter{topnumber}{2}
\def\topfraction{.7}
\setcounter{bottomnumber}{1}
\def\bottomfraction{.3}
\setcounter{totalnumber}{3}
\def\textfraction{.2}
\def\floatpagefraction{.5}
\setcounter{dbltopnumber}{2}
\def\dbltopfraction{.7}
\def\dblfloatpagefraction{.5}

\long\def\@makecaption#1#2{
   \vskip 10pt 
   \setbox\@tempboxa\hbox{#1: #2}
   \ifdim \wd\@tempboxa >\hsize   % IF longer than one line:
       #1: #2\par                 %   THEN set as ordinary paragraph.
     \else                        %   ELSE  center.
       \hbox to\hsize{\hfil\box\@tempboxa\hfil}  
   \fi}

\newcounter{figure}
\def\thefigure{\@arabic\c@figure}
\def\fps@figure{tbp}
\def\ftype@figure{1}
\def\ext@figure{lof}
\def\fnum@figure{Figure \thefigure}
\def\figure{\@float{figure}}
\let\endfigure\end@float
\@namedef{figure*}{\@dblfloat{figure}}
\@namedef{endfigure*}{\end@dblfloat}
\newcounter{table}
\def\thetable{\@arabic\c@table}
\def\fps@table{tbp}
\def\ftype@table{2}
\def\ext@table{lot}
\def\fnum@table{Table \thetable}
\def\table{\@float{table}}
\let\endtable\end@float
\@namedef{table*}{\@dblfloat{table}}
\@namedef{endtable*}{\end@dblfloat}


\def\maketitle{\par
 \begingroup
%   \def\thefootnote{\fnsymbol{footnote}}
   \def\thefootnote{\arabic{footnote}}
   \def\@makefnmark{\hbox   
       to 0pt{$^{\@thefnmark}$\hss}}   
   \if@twocolumn               
     \twocolumn[\@maketitle]
%    \global\advance\vsize by -4.5pc\relax  % Allow space for copyright notice
     \global\advance\vsize by -6pc\relax    % Allow space for copyright notice
     \else \newpage
     \global\@topnum\z@        % Prevents figures from going at top of page.
     \@maketitle \fi\thispagestyle{empty}\@thanks
 \endgroup
 \setcounter{footnote}{0}
 \let\maketitle\relax
 \let\@maketitle\relax
 \gdef\@thanks{}\gdef\@author{}\gdef\@title{}\let\thanks\relax}

\newbox\@acmtitlebox
\def\@maketitle{\newpage
 \null
 \setbox\@acmtitlebox\vbox{%
   \vskip 2em                      % Vertical space above title.
   \begin{center}
    {\huge \@title \par}           % Title set in \huge size. 
    \vskip 1.5em                   % Vertical space after title.
    {\LARGE                        % each author set in \LARGE, in a
     \lineskip .5em                % tabular environment
     \begin{tabular}[t]{c}\@author \\ {\bf \@affiliation}
     \end{tabular}\par}                   
    \vskip  1.5em              % Vertical space after author.
   \end{center}}
 \dimen0=\ht\@acmtitlebox
 \advance\dimen0 by -13.5pc\relax
 \unvbox\@acmtitlebox
 \ifdim\dimen0<0.0pt\relax\vskip-\dimen0\fi
 \vskip 2em                    %vertical space after title box DSE
			       %ADDED THIS 4/21/90
 }

\def\abstract{\if@twocolumn
\section*{Abstract}
\else \small 
\begin{center}
{\centerline{\bf Abstract}\vspace{-.5em}\vspace{0pt}}
\end{center}
\quotation 
\fi}

\def\endabstract{\if@twocolumn\else\endquotation\fi}

\renewenvironment{abstract}{\centerline{\normalsize\bf
 Abstract}\vspace{0.5ex}\begin{quote}}{\par\end{quote}\vskip 1ex}


\def\marginpar{\@latexerr{The \marginpar command is not allowed in the
  `acmconf' document style.}\@eha}

\mark{{}{}}   % Initializes TeX's marks

\def\ps@plain{\@latexerr{Error in \pagestyle command:  Only the `empty'
  pagestyle is allowed in the `acmconf' document style.}\@eha}
\def\ps@headings{\@latexerr{Error in \pagestyle command:  Only the `empty'
  pagestyle is allowed in the `acmconf' document style.}\@eha}
\def\ps@myheadings{\@latexerr{Error in \pagestyle command:  Only the `empty'
  pagestyle is allowed in the `acmconf' document style.}\@eha}

\def\today{\ifcase\month\or
  January\or February\or March\or April\or May\or June\or
  July\or August\or September\or October\or November\or December\fi
  \space\number\day, \number\year}

\ps@empty                   % 'empty' page style
\pagenumbering{arabic}      % Arabic page numbers
\twocolumn                  % Double column.
\raggedbottom		    % Ragged bottom