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+%% xyidioms.tex from $Id: xyidioms.doc,v 3.4 1997/05/18 01:14:25 krisrose Exp $
+%%
+%% Format-dependent idioms for Xy-pic.
+%% Copyright (c) 1991-1997 Kristoffer H. Rose <krisrose@brics.dk>
+%%
+%% This file is part of the Xy-pic package for graphs and diagrams in TeX.
+%% See the companion README and INSTALL files for further information.
+%% Copyright (c) 1991-1997 Kristoffer H. Rose <krisrose@brics.dk>
+%%
+%% The Xy-pic package is free software; you can redistribute it and/or modify
+%% it under the terms of the GNU General Public License as published by the
+%% Free Software Foundation; either version 2 of the License, or (at your
+%% option) any later version.
+%%
+%% The Xy-pic package is distributed in the hope that it will be useful, but
+%% WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+%% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+%% for more details.
+%%
+%% You should have received a copy of the GNU General Public License along
+%% with this package; if not, write to the Free Software Foundation, Inc.,
+%% 675 Mass Ave, Cambridge, MA 02139, USA.
+%%
+\ifx\xyidiomsloaded\empty \message{not reloaded}\endinput \fi
+\let\xyidiomsloaded=\empty
+\xywarnifdefined\A@ \dimendef\A@=4
+\xywarnifdefined\B@ \dimendef\B@=6
+\xywarnifdefined\R@ \dimendef\R@=8
+\ifx\undefined\AveryUNLIKELYc@ntr@lSEQUENCE@@\else
+\errmessage{Xy-pic Error: \string\undefined\space defined.}\fi
+\ifx\undefined\literal@ \def\literal@#1{#1}\fi
+\ifx\undefined\eat@ \def\eat@#1{}\fi
+\xydef@\xyFN@{\futurelet\next}
+\ifx\undefined\DN@ \def\DN@{\def\next@}\fi
+\ifx\undefined\DNii@ \def\DNii@{\def\nextii@}\fi
+\ifx\undefined\setboxz@h\def\setboxz@h{\setbox\z@\hbox}\fi
+\ifx\undefined\wdz@ \def\wdz@{\wd\z@}\fi
+\ifx\undefined\boxz@ \def\boxz@{\box\z@}\fi
+\ifx\undefined\W@ \def\W@{\immediate\write16 }\fi
+\ifx\undefined\space@ \def\space@.{\futurelet\space@\relax}\space@. \fi
+\ifx\undefined\notempty \def\notempty#1{T\if @#1@F\else T\fi}\fi
+\xydef@\xysetup@dummy#1{\xyuncatcodes#1}
+\xywarnifdefined\xysetup@@
+\ifx\AtEndDocument\undefined
+ \expandafter\ifx\csname amsppt.sty\endcsname\relax
+ \let\xysetup@@=\xysetup@dummy
+ \else
+ \def\xysetup@@#1{%
+ \expandafter\def\expandafter\topmatter\expandafter{\topmatter
+ #1\xyuncatcodes}}\fi
+\else
+ \def\xysetup@@#1{\AtBeginDocument{#1\xyuncatcodes}}
+\fi
+\ifx\xysetup@@\xysetup@dummy\else
+ \xysetup@@{\let\xysetup@@=\xysetup@dummy \xyuncatcodes}\fi
+\xywarnifdefined\xyclosedown@@
+\ifx\AtEndDocument\undefined \let\xyclosedown@@=\eat@
+\else \def\xyclosedown@@#1{\AtEndDocument{#1}}\fi
+\xylet@\xy@begindvi=\literal@
+\ifx\undefined\AtBeginDvi\else
+ \AtBeginDocument{\let\xy@begindvi=\AtBeginDvi}
+ \AtBeginDvi{\global\let\xy@begindvi=\literal@}\fi
+\ifx\amstexloaded@\relax
+\xylet@\toks@ii=\toks@@ \endinput \fi
+\ifx\@tempcnta\undefined
+\xynew@{count}\count@@
+\xynew@{count}\count@@@
+\else
+\xylet@\count@@=\@tempcnta
+\xylet@\count@@@=\@tempcntb
+\fi
+\ifx\undefined\toks@ii \toksdef\toks@ii=2 \fi
+\endinput