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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 25.1.17.1, p. III-334.
+% Original source in file "macros5.TEX", starting line 1018.
+\wlog{L: "compst.tip" ["macros5.TEX," l. 1018, p. III-334]}%
+% This file DOES belong to format "texip."
+\InputD{restring.tip}
+\catcode`\@ = 11
+\def\StringsEqualConditional #1#2{%
+ TT\fi
+ \edef\@StringsEqualOneConditional{#1}%
+ \edef\@StringsEqualTwoConditional{#2}%
+ \ifx\@StringsEqualOneConditional\@StringsEqualTwoConditional
+}
+\def\EmptyStringConditional #1{%
+ TT\fi
+ \if\StringsEqualConditional{#1}{}%
+}
+\def\EmptyStringConditionalISpaces #1{%
+ TT\fi
+ \ReplaceSubStrings{\@EmptyStringConditionalISpaces}{#1}%
+ { }{}%
+ \if\EmptyStringConditional
+ {\@EmptyStringConditionalISpaces}%
+}
+\catcode`\@ = 12