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+% This macro source file is from the four volume series
+% "TeX in Practice" by Stephan von Bechtolsheim, published
+% 1993 by Springer-Verlag, New York.
+% Copyright 1993 Stephan von Bechtolsheim.
+% No warranty or liability is assumed.
+% This macro may be copied freely if no fees other than
+% media cost or shipping charges are charged and as long
+% as this copyright and the following source code itself
+% is not changed. Please see the series for further information.
+%
+% Version: 1.0
+% Date: May 1, 1993
+%
+%
+% This source code is documented in 11.2.1, p. II-67.
+% Original source in file "par2.TEX", starting line 956.
+\wlog{L: "parv-1.tip" ["par2.TEX," l. 956, p. II-67]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\newdimen \Delta@XY
+\newskip\@ParListBeforeAfter
+\newskip\@ParListBetweenLabels
+\newskip\@ParListAfterLabel
+\newcount\@LabeledParNesting \@LabeledParNesting = 0
+\newcount\@LabelCounter
+\def\BeginAList #1#2#3#4#5#6#7{%
+ \par
+ \bgroup
+ \advance\leftskip by #1
+ \advance\rightskip by #2
+ \advance \@LabeledParNesting by 1
+ \@LabelCounter = 0
+ \Delta@XY = #3
+ \ifdim\Delta@XY < 0pt
+ \errmessage{\string\BeginAList: negative Delta{xy},
+ made positive.}%
+ \fi
+ \@ParListBeforeAfter = #4
+ \@ParListBetweenLabels = #5
+ \@ParListAfterLabel = #6
+ \SetParIndent{#7}
+}
+\def\EndAList{%
+ \par
+ \vskip\@ParListBeforeAfter
+ \egroup
+}
+\def\@GenLabel #1{%
+ \par
+ \advance\@LabelCounter by 1
+ \ifnum\@LabelCounter = 1
+ \parskip = \@ParListBeforeAfter
+ \else
+ \parskip = \@ParListBetweenLabels
+ \fi
+ \noindent
+ \hbox to 0pt{#1}%
+ \parskip = \@ParListAfterLabel
+ \ignorespaces
+}
+\def\ItemLL #1{%
+ \@GenLabel{%
+ \hskip -\Delta@XY
+ #1%
+ \hfil
+ }%
+}
+\def\ItemLR #1{%
+ \@GenLabel{%
+ \hss
+ #1%
+ \hskip\Delta@XY
+ }%
+}
+\def\ItemRL #1{%
+ \@GenLabel{%
+ \hskip\Delta@XY
+ #1%
+ \hss
+ }%
+}
+\def\ItemRR #1{%
+ \@GenLabel{%
+ \hfil
+ #1%
+ \hskip -\Delta@XY
+ }%
+}
+\catcode`\@ = 12