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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 11.1.7, p. II-62.
+% Original source in file "par2.TEX", starting line 737.
+\wlog{L: "par-lcl.tip" ["par2.TEX," l. 737, p. II-62]}%
+% This file DOES NOT belong to format "texip."
+\InputD{par-lab.tip}
+\catcode`\@ = 11
+\newcount\@LabelCounter
+\def\CountingItem{%
+ \advance\@LabelCounter by 1
+ \ifcase\@LabeledParNesting
+ \or
+ \ItemLR{\the\@LabelCounter.}%
+ \or
+ \ItemLR{%
+ \advance\@LabelCounter by `\a
+ (\char\@LabelCounter)%
+ }%
+ \or
+ \ItemLR{\romannumeral\@LabelCounter.}%
+ \else
+ \errmessage{\string\CountingItem: nesting level up to 3
+ supported only.}%
+ \fi
+}
+\catcode`\@ = 12