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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 3.3.12, p. I-57.
+% Original source in file "reg1.TEX", starting line 1523.
+\wlog{L: "absval.tip" ["reg1.TEX," l. 1523, p. I-57]}%
+% This file DOES belong to format "texip."
+\def\AbsoluteValue #1#2{%
+ \ifnum #1<0
+ #2 = -#1\relax
+ \else
+ #2 = #1\relax
+ \fi
+}