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+%%%%%%%%%%%%%%%%%%%%%%%%%%% -*- Mode: Latex -*- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% seminar.bg3 --- Corrections for compatibility problems and new bugs
+%% found in the Seminar package, and few new additions
+%% to help overlays management for PDF output files.
+%% (see also the seminar.bug file in Seminar distribution)
+%%
+%% Disclaimer: this file is mine and doesn't engage TVZ!
+%%
+%% Note: insert it after \usepackage{graphicx} if you use `graphicx'
+%% and after \usepackage{longtable} if you use `longtable'
+%%
+%% Author : Denis GIROU (CNRS/IDRIS - France) <Denis.Girou@idris.fr>
+%% Created the : 1995
+%% Last mod. by : Patrice MEGRET (FPMs - Belgium) <patrice.megret@fpms.ac.be>
+%% Last mod. the : Sunday February 29 2004
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\def\FileVersion{2.3}
+\def\FileDate{2014/05/12}
+\typeout{seminar.bg3: various corrections for the Seminar document class^^J%
+ added since seminar.bug and few add-ons for overlays^^J%
+ (Version \FileVersion\space of <\FileDate> (P.M.))}
+
+\edef\TheAtCode{\the\catcode`\@}
+\catcode`\@=11
+
+% PM modification begin PM December 6, 2003
+% ce nouveau test permet de choisir entre un footer
+% verticalement centré \footervcenter = true (default)
+% ou non \footervcenter = false
+\newif\iffootervcenter \footervcentertrue
+% PM modification end December 6, 2003
+
+
+% 1 - To correct a bug in the note environment
+% (reported by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - 1995)
+\@savsf=1
+
+
+% 2 - To correct several bugs to generate a list of slides with subsection
+% entries
+% (reported by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - Jul. 18, 1995)
+% - To clear the subheading when a new heading is defined
+% (reported by Axel Thimm - <thimm@physik.fu-berlin.de> - June 5, 1997)
+% - To assure coherence between heading and subheading when used
+% in header/footer, for article mode
+% (reported by Axel Thimm - <thimm@physik.fu-berlin.de> - June 5, 1997)
+% - Improvements (\refstepcounter and \@addtoreset) by Jeremy Gibbons
+% <jgibbons@brookes.ac.uk> - Sep. 30, 1997
+
+% Used by the \slide@subheading macro but undefined
+\def\theslidesubsection{\theslidesection.\arabic{slidesubsection}}
+
+\def\slide@heading[#1]#2{%
+ \refstepcounter{slidesection}%
+ \@addtoreset{slidesubsection}{slidesection}
+ \addtocontents{los}{\protect\l@slide
+ {\the\c@slidesection}{\ignorespaces#1}{\@SCTR}}%
+ \def\@tempa{#2}%
+ \ifx\@tempa\@empty\else
+ {\edef\@currentlabel{\csname p@slidesection\endcsname\theslidesection}%
+ \makeslideheading{#2}}%
+ \fi
+ \gdef\theslideheading{#1}%
+ \gdef\theslidesubheading{}%
+}
+
+\def\slide@subheading[#1]#2{%
+ \refstepcounter{slidesubsection}%
+ \addtocontents{los}{\protect\l@subslide
+ {\the\c@slidesubsection}{\ignorespaces#1}{\@SCTR}}%
+ \def\@tempa{#2}%
+ \ifx\@tempa\@empty\else
+ {\edef\@currentlabel{\csname p@slidesubsection\endcsname
+ \theslidesubsection}\makeslidesubheading{#2}}%
+ \fi
+ \gdef\theslidesubheading{#1}%
+}
+
+
+% 3 - To correct a bug in the \slidecontents macro
+% (reported by Denis Roegel (LORIA) <Denis.Roegel@loria.fr> - Sep. 22, 1996)
+
+\long\def\@gobblethree #1#2#3{}
+
+\def\slide@contents{%
+ \def\l@slide##1##2##3{%
+ \slide@cline{\slidenumberline{##1}{##2}}{##3}}%
+ \let\l@subslide\@gobblethree
+ \@startlos}
+
+
+% 4 - To solve incompatibility between the `graphicx' package and Seminar.
+% The \espfslidesize Seminar macro work only with the old version of
+% the `epsfig' package, so with \includegraphics the PostScript files are
+% always scaled without the possibility to leave them to there natural
+% size. And also these files are not correctly scaled when we switch
+% from normal to article mode under Seminar. So, we must redefined the
+% \epsfslidesize macro of Seminar and modify few internal macros of
+% `graphicx'.
+% (Note: I consider only the `graphicX' package, not the 'graphicS' one)
+% (reported by Karl Tombre (LORIA) <Karl.Tombre@loria.fr> and
+% Denis Roegel (LORIA) <Denis.Roegel@loria.fr> - Jan. 16, 1997)
+
+\def\GraphicsNotScaled{%
+\ifx\Gin@viewport\undefined
+\else % Graphicx package detected
+\def\Gin@i{%
+ \def\Gin@req@sizes{%
+ \Gin@nat@height=\inverseslidesmag\Gin@nat@height
+ \Gin@nat@width=\inverseslidesmag\Gin@nat@width
+ \Gin@req@height\Gin@nat@height
+ \Gin@req@width\Gin@nat@width}%
+ \@ifnextchar[\Gin@ii{\Gin@ii[]}}
+\define@key{Gin}{width}{%
+\@tempdima=##1\@tempdima=\inverseslidesmag\@tempdima\def\Gin@ewidth{\@tempdima}}
+\define@key{Gin}{height}{%
+\@tempdima=##1\@tempdima=\inverseslidesmag\@tempdima\def\Gin@eheight{\@tempdima}}
+\define@key{Gin}{totalheight}{%
+\def\Gin@eresize{\totalheight}%
+\@tempdima=##1\@tempdima=\inverseslidesmag\@tempdima\def\Gin@eheight{\@tempdima}}
+\fi}
+
+\def\epsfslidesize{%
+\let\epsfsize\slide@epsfsize
+\GraphicsNotScaled}
+
+
+% 5 - To solve incompatibily between the LongTable package and Seminar
+% (reported by Bhaskar Manda (UIUC) <bhaskar@or4.me.uiuc.edu> - May 7, 1997)
+% - Problem in article format seen later
+% (reported by Axel Thimm <thimm@physik.fu-berlin.de> - June 5, 1997)
+
+% From seminar.cls
+\def\slide@outputLT{% (from \slide@output)
+ \@makeslide
+ \@testfalse
+ \ifnotesonly\else
+ \iflandscape
+ \ifnum\@landscapeonly>-1 \os@test\fi
+ \else
+ \ifnum\@landscapeonly<1 \os@test\fi
+ \fi
+ \fi
+ \if@test
+ \reset@slideoutput
+ \@@makeslideLT
+ \process@slide
+ \fi
+ \refstepcounter{slide}}
+\def\@@makeslideLT{% (from \@@makeslide)
+ \overfullslide@warning
+ \setbox\@slidebox\hbox{%
+ \vfuzz=\slidefuzz\relax
+ \vbox to\slide@vsize{%
+ \box\@outputbox
+ \ifcenterslides\vskip\z@ plus .0001fil \fi
+ \unvbox\@slidebox
+ \vskip\z@ plus .0001fil}%
+ \the\after@slidepage}%
+ \wd\@slidebox\textwidth}
+
+% From LongTable
+\def\LT@output{%
+ \ifnum\outputpenalty <-\@Mi
+ \ifnum\outputpenalty > -\LT@end@pen
+ \LT@err{floats and marginpars not allowed in a longtable}\@ehc
+ \else
+ \setbox\z@\vbox{\unvbox\@cclv}%
+ \ifdim \ht\LT@lastfoot>\ht\LT@foot
+ \dimen@\pagegoal
+ \advance\dimen@-\ht\LT@lastfoot
+ \ifdim\dimen@<\ht\z@
+ \setbox\@cclv\vbox{\unvbox\z@\copy\LT@foot\vss}%
+ \@makecol
+ \slide@outputLT
+ \setbox\z@\vbox{\box\LT@head}%
+ \fi
+ \fi
+ \global\@colroom\@colht
+ \global\vsize\@colht
+ \vbox
+ {\unvbox\z@\box\ifvoid\LT@lastfoot\LT@foot\else\LT@lastfoot\fi}%
+ \fi
+ \else
+ \setbox\@cclv\vbox{\unvbox\@cclv\copy\LT@foot\vss}%
+ \@makecol
+ \slide@outputLT
+ \copy\LT@head
+ \fi}
+
+% We must adjust \textheight. Sometimes, you must increase it a little by
+% something like \addtolength{\textheight}{5mm}
+% But if you use slides like \begin{slide*}[15cm,10cm]
+% you must define locally \textheight=15cm
+\addtolength{\textheight}{-\headheight}
+
+
+% 6 - To allow automatic changes of language dependent labels,
+% for instance by loading the `french' package after Seminar
+% (suggested by Bernard Gaulle (IDRIS) <gaulle@idris.fr> - Nov. 20, 1997)
+% From seminar.cls
+\def\slidename{Slide}
+\def\slidelabel{\bf\slidename{} \theslide}
+% From slidesec.sty
+\def\listslidename{List of Slides}%
+\def\listofslides{\section*{\listslidename%
+\@mkboth{\expandafter\MakeUppercase\listslidename}%
+ {\expandafter\MakeUppercase\listslidename}}%
+ \def\l@slide##1##2##3{%
+ \slide@undottedcline{\slidenumberline{##3}{##2}}{}}%
+ \let\l@subslide\l@slide
+ \@startlos}
+
+
+% 7 - There were several problems when doing a global change of color
+% outside the "slide"environment (using the \color{ColorName} macro
+% of the `color' package) if this change was not done globally
+% (that is to say before the "\begin{document}") but inside the document,
+% for a part of the slides.
+% These problems can be seen specially for screen presentations,
+% when we want to use a dark background, so a light foreground color
+% for the text.
+% First, the header (defining for instance with the `fancyhdr' package)
+% changed of color one slide later and was restored one slide later too
+% if the change of the color was mas inside a group for some slides,
+% and second, the black color was forced by the footer.
+% We solve the first problem by usage of the same technique than the one
+% used by Seminar for global changes based on \special macros and made
+% before the "\begin{document}". We save the \specials in the
+% \saved@specials box and insert it at the beginning of the \@slidebox box
+% with the \insert@specials macro, as for the first slide.
+% And we solve the second problem by suppression of the command in the
+% hook which force the black color (defined in the `semcolor' package).
+% (reported by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - 1999-2002)
+
+% Built from \save@srlidespecials (for all slides excepted the first one)
+\def\save@slidespecials@ii{%
+ \begingroup
+ \output{%
+ \global\setbox\saved@specials=\box\@cclv
+ \global\wd\saved@specials=\z@
+ \global\dp\saved@specials=\z@
+ \global\ht\saved@specials=\z@}%
+ \hbox{}\penalty-\@M
+ \endgroup}%
+
+% The first slide is already managed, so we will define \save@slidespecials@i
+% started to the second one only...
+\def\save@slidespecials@i{}%
+
+\ifarticle\else
+ \def\insert@specials{%
+ \ifvoid\saved@specials\else
+ \setbox\@slidebox\hbox{\box\saved@specials\box\@slidebox}%
+ \fi
+ \global\let\save@slidespecials@i\save@slidespecials@ii}
+\fi
+
+\addto@hook{\before@newslide}{\save@slidespecials@i}
+
+\after@slidepage={}
+
+
+% 7 - To vertically correctly center the footer, if defined
+% (this is mainly visible when using the `fancyhdr' package, and specially
+% when a footer rule line is defined)
+% (reported by Denis Girou (CNRS/IDRIS) - <Denis.Girou@idris.fr> - April 1998)
+
+% 8 - Add-on to allow "full screen" backgrounds.
+% Seminar originally support only partial backgrounds, which doesn't cover
+% the full page but only the place of the text. It cannot be easily
+% modified, as there are dependancies between the header and the text.
+% So, we choose to define new macros \SeminarNewSlideFrameBackground
+% and \SeminarSlideFrameBackground to manage the full screen backgrounds,
+% designed on the model of the \newslideframe and \slideframe ones.
+% (added by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - Jun. 30, 1999)
+
+\newbox\Seminar@SlideBoxBackground
+\ifarticle
+\else
+ \def\output@slide{%
+ \begingroup
+ \hoffset=-\inverseslidesmag in
+ \voffset=-\inverseslidesmag in
+ \setslidelength\@tempdima{%
+ \ifportrait\paperwidth\else\paperheight\fi}%
+ \setslidelength\@tempdimb{%
+ \ifportrait\paperheight\else\paperwidth\fi}%
+ \ifrotateheaders
+ \@ifrotateslide{%
+ \dimen@=\@tempdima
+ \@tempdima=\@tempdimb
+ \@tempdimb=\dimen@}
+ \fi
+ % \oddsidemargin, \evensidemargin, \headheight, \footheight
+ % used for scratch:
+ % Some page styles like to know \textwidth:
+ \setslidelength\headheight\slidetopmargin
+ \setslidelength\footheight\slidebottommargin
+ \ifautoslidemargins
+ \textwidth=\wd\@slidebox
+ \oddsidemargin=\@tempdima
+ \advance\oddsidemargin-\textwidth
+ \divide\oddsidemargin 2
+ \else
+ \setslidelength\oddsidemargin\slideleftmargin
+ \setslidelength\evensidemargin\sliderightmargin
+ \textwidth=\@tempdima
+ \advance\textwidth-\oddsidemargin
+ \advance\textwidth-\evensidemargin
+ \fi
+ \setbox\@slidebox=\hbox to \@tempdima{%
+ \box\Seminar@SlideBoxBackground
+ \kern\oddsidemargin
+ \vbox to\@tempdimb{%
+ \ifnum\fancyput@flag>-1
+ \hbox{\kern-\oddsidemargin\do@fancyput}%
+ \fi
+ \let\label\@gobble
+ \let\index\@gobble
+ \let\glossary\@gobble
+ \vbox to\headheight{%
+ \vfill
+ \hbox{%
+ \slideheadfont\relax\strut
+ \hbox to\textwidth{\@oddhead}}%
+ \kern\z@}%
+ \vfill
+ \hbox to\textwidth{\hss\box\@slidebox\hss}%
+ \vfill
+ \vbox to\footheight{%
+ \iffootervcenter
+ \vfill
+ \fi
+ \hbox{%
+ \slidefootfont\relax\strut
+ \hbox to\textwidth{\@oddfoot}}%
+ \vfill}}%
+ \hss}%
+ \ifrotateheaders\@ifrotateslide\rotate@slide\fi
+ \insert@specials
+ \let\protect\noexpand
+ \shipout\box\@slidebox
+ \endgroup
+ \let\firstmark\botmark}
+ \@ifundefined{fancyput@flag}{\def\fancyput@flag{-1}}{}
+\fi
+
+
+\def\finish@slide{%
+ \theSlideFrameBackground
+ \theslideframe
+ \add@slidelabel\slidelabel}
+
+
+\def\SeminarNewSlideFrameBackground#1{%
+ \@ifnextchar[{\@SeminarNewSlideFrameBackground{#1}}%
+ {\@SeminarNewSlideFrameBackground{#1}[]}}
+\def\@SeminarNewSlideFrameBackground#1[#2]{%
+ \@namedef{semsfbops@#1}{#2}%
+ \@namedef{semsfb@#1}##1}
+
+\def\SeminarSlideFrameBackground{\Seminar@SlideFrameBackground{Slide}}
+\def\Seminar@SlideFrameBackground#1{%
+ \@ifstar{\@testtrue\Seminar@@SlideFrameBackground{#1}}%
+ {\@testfalse\Seminar@@SlideFrameBackground{#1}}}
+\def\Seminar@@SlideFrameBackground#1{%
+ \@ifnextchar[{\Seminar@@@SlideFrameBackground{#1}}%
+ {\Seminar@@@SlideFrameBackground{#1}[]}}
+\def\Seminar@@@SlideFrameBackground#1[#2]#3{%
+ \def\@tempa{none}%
+ \def\@tempb{#3}%
+ \ifx\@tempa\@tempb
+ \@namedef{the#1FrameBackground}{\relax}%
+ \else
+ \ifx\@tempb\@empty
+ \@namedef{the#1FrameBackground}{}%
+ \else
+ \@ifundefined{semsfb@#3}%
+ {\@seminarerr{Background slide frame `#3' undefined}\@eha}%
+ {\if@test
+ \Seminar@@@@SlideFrameBackground{#1}[#2]{#3}%
+ \else
+ \@namedef{the#1FrameBackground}{%
+ \setbox\Seminar@SlideBoxBackground=\hbox{{%
+ \@nameuse{semsfbops@#3}#2%
+ \@nameuse{semsfb@#3}{\box\Seminar@SlideBoxBackground}}}}%
+ \fi}%
+ \fi
+ \fi}
+\def\Seminar@@@@SlideFrameBackground#1[#2]#3{%
+ \expandafter\let\expandafter\@tempa\csname the#1FrameBackground\endcsname
+ \edef\next{%
+ \noexpand\def\expandafter\noexpand\csname the#1FrameBackground\endcsname}%
+ \expandafter\next\expandafter{\@tempa
+ \setbox\Seminar@SlideBoxBackground=\hbox{{%
+ \@nameuse{semsfbops@#3}%
+ #2%
+ \@nameuse{semsfb@#3}{\box\Seminar@SlideBoxBackground}}}}}%
+
+\SeminarSlideFrameBackground{none}
+
+
+% 9 - For screen presentations, and specially animated graphics,
+% we need more than 10 overlays. We increase the limit to 676 (26^2).
+% (added by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - Dec. 5, 2001)
+
+\def\overlay#1{%
+ \ifoverlays\ifx\@overlay\relax\nooverlays@err\fi\fi
+ \ifslide
+ \@tempcnta=#1
+ \@testfalse
+ \ifnum\@tempcnta>-2 \ifnum\@tempcnta<677 \@testtrue\fi\fi
+ \if@test
+ \c@overlay=\@tempcnta
+ \ifnum\c@overlay=0
+ \advance\c@slide by -1
+ \refstepcounter{slide}%
+ \else
+ \advance\c@overlay by -1
+ \refstepcounter{overlay}%
+ \ifoverlays
+ \xdef\overlay@list{\overlay@list,\the\c@overlay}%
+ \fi
+ \fi
+ \ifoverlays
+ \@overlay{\the\c@overlay}%
+ \fi
+ \else
+ \@seminarerr{\string\overlay\space argument must be
+ an integer between 0 and 676}\@eha
+ \fi
+ \else
+ \@seminarerr{\string\overlay\space can only be used
+ in slide environments}\@eha
+ \fi
+ \ignorespaces}
+
+\def\overlay@loop{%
+ \begingroup
+ \overlay@prep
+ \c@overlay=1
+ \@whilenum\c@overlay<677
+ \do{%
+ \test@member{\the\c@overlay}{\overlay@list}%
+ \if@test
+ \make@overlay{\the\c@overlay}%
+ \finish@slide
+ \output@slide
+ \fi
+ \layer@loop{\the\c@overlay}%
+ \advance\c@overlay by 1}%
+ \endgroup}
+
+\def\theoverlay{{%
+\ifnum\c@overlay>26
+ \@tempcnta=\c@overlay
+ \advance\@tempcnta\m@ne
+ \divide\@tempcnta by 26
+ \multiply\@tempcnta by 26
+ \@tempcntb=\c@overlay
+ \advance\@tempcntb-\@tempcnta
+ \@tempcnta=\c@overlay
+ \advance\@tempcnta\m@ne
+ \divide\@tempcnta by 26
+ \theslide-\@alph{\@tempcnta}\@alph{\@tempcntb}%
+\else
+ \theslide-\alph{overlay}%
+\fi}}
+
+
+% 10 - Addition for management of cumulative and progressive overlays.
+% Due to PSTricks, Seminar had since the beginning the required
+% capabilities to manage overlays in various ways. The only thing
+% to do is to redefine the PSTricks \pst@initoverlay macro in the
+% relevant way.
+% (added by Denis Girou (CNRS/IDRIS) <Denis.Girou@idris.fr> - 1999-2001)
+
+% From `semcolor'
+\def\make@overlay#1{%
+ \setbox\@slidebox=\hbox{%
+ \pst@initoverlay{#1}%
+ \pst@Verb{0 \tx@BOL }%
+ \copy\@@slidebox
+ \pst@Verb{-1 \tx@BOL }}}
+
+\iffalse
+% We must redefine too the /BeginOL macro form pstricks.pro, as "all" is now -1
+\def\pst@initoverlay#1{%
+\pst@Verb{%
+/BeginOL {%
+ dup -1 eq exch TheOL eq or
+ {IfVisible not
+ {Visible /IfVisible true def}
+ if}
+ {IfVisible
+ {Invisible /IfVisible false def}
+ if}
+ ifelse} def
+\tx@InitOL end
+/TheOL #1 def}}
+
+\def\pst@overlay#1{%
+\edef\curr@overlay{#1}%
+\pst@Verb{#1 \tx@BOL }%
+\aftergroup\pst@endoverlay}
+\def\pst@endoverlay{%
+\pst@Verb{\curr@overlay\space \tx@BOL }}
+\fi
+
+% Cumulative overlays
+% ===================
+
+% Cumulative overlays, to force to print all preceding ones
+\def\SeminarCumulativeOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+ dup -1 eq exch TheOL le or
+ {IfVisible not
+ {Visible /IfVisible true def}
+ if}
+ {IfVisible
+ {Invisible /IfVisible false def}
+ if}
+ ifelse} def
+\tx@InitOL end
+/TheOL ##1 def}}}
+
+% Alternative method for same goal (needed when PSTricks nodes are used)
+\def\SeminarAltCumulativeOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+ dup -1 eq exch TheOL le or
+ {IfVisible not
+ {Visible /IfVisible true def}
+ if}
+ {IfVisible
+ {Invisible /IfVisible false def}
+ if}
+ ifelse} def
+\tx@InitOL end
+/Visible {initclip} def
+/Invisible {CP newpath OLUnit itransform moveto clip newpath moveto} def
+/TheOL ##1 def}}}
+
+% Progressive overlays
+% ====================
+
+% Progressive overlays (at step i, only overlays 0 and i are shown)
+\def\SeminarProgressiveOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+ /NumOL ED
+ NumOL -1 eq NumOL 0 eq NumOL TheOL eq or or
+ {IfVisible not
+ {Visible /IfVisible true def}
+ if}
+ {IfVisible
+ {Invisible /IfVisible false def}
+ if}
+ ifelse} def
+\tx@InitOL end
+/TheOL ##1 def}}}
+
+% Alternative method for the same goal (needed when PSTricks nodes are used)
+\def\SeminarAltProgressiveOverlays{%
+\def\pst@initoverlay##1{%
+\pst@Verb{%
+/BeginOL {%
+ /NumOL ED
+ NumOL -1 eq NumOL 0 eq NumOL TheOL eq or or
+ {IfVisible not
+ {Visible /IfVisible true def}
+ if}
+ {IfVisible
+ {Invisible /IfVisible false def}
+ if}
+ ifelse} def
+\tx@InitOL end
+/Visible {initclip} def
+/Invisible {CP newpath OLUnit itransform moveto clip newpath moveto} def
+/TheOL ##1 def}}}
+
+% Generation of the next overlay (minor add-on)
+% =============================================
+% (it increment automatically the number of the current overlay)
+\newcommand{\SeminarNextOverlay}[1]{%
+\addtocounter{overlay}{1}%
+\begin{overlay}{\the\c@overlay}#1\end{overlay}}
+
+% To force all items in the various list environments to appear
+% in their own overlay (minor add-on)
+% ==================================
+\let\itemORIG\item
+
+\def\SeminarItemInOverlay{%
+\def\item{%
+\addtocounter{overlay}{1}%
+\overlay{\the\c@overlay}%
+\itemORIG}}
+
+\catcode`\@=\TheAtCode\relax
+\endinput
+%% END seminar.bg3