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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 9.3.6.1, p. I-327.
+% Original source in file "boxit.TEX", starting line 719.
+\wlog{L: "boxing5.tip" ["boxit.TEX," l. 719, p. I-327]}%
+% This file DOES belong to format "texip."
+\InputD{box-zero.tip}
+\InputD{box-bul.tip}
+\InputD{box-bb.tip}
+\InputD{box-thck.tip}
+\catcode`\@ = 11
+\newif\ifBulletAndBaseLine
+\BulletAndBaseLinetrue
+\def\RulesOutSide #1#2#3{%
+ {%
+ \setbox 0 = \hbox{%
+ \ifBulletAndBaseLine
+ \copy\@BulletBox
+ \fi
+ \hskip -\BoxRuleThickness
+ \vrule width \BoxRuleThickness height #1 depth #2%
+ \hskip #3%
+ \vrule width \BoxRuleThickness height #1 depth #2%
+ \dimen0 = #3%
+ \advance \dimen0 by 2\BoxRuleThickness
+ \hskip -\dimen0
+ \dimen2 = #1%
+ \advance\dimen2 by \BoxRuleThickness
+ \vrule width \dimen0 height \dimen2 depth -#1%
+ \hskip -\dimen0
+ \dimen2 = #2%
+ \advance\dimen2 by \BoxRuleThickness
+ \vrule width \dimen0 height -#2 depth \dimen2
+ }%
+ \ZeroBoxOut{0}%
+ }%
+}
+\def\RulesInSide #1#2#3{%
+ {%
+ \setbox 0 = \hbox{%
+ \ifBulletAndBaseLine
+ \copy\@BulletBox
+ \fi
+ \vrule width \BoxRuleThickness height #1 depth #2%
+ \hskip #3%
+ \hskip -\BoxRuleThickness
+ \hskip -\BoxRuleThickness
+ \vrule width \BoxRuleThickness height #1 depth #2%
+ \hskip -#3%
+ \dimen2 = #1%
+ \advance\dimen2 by -\BoxRuleThickness
+ \vrule width #3 height #1 depth -\dimen2
+ \hskip -#3%
+ \dimen2 = #2%
+ \advance\dimen2 by -\BoxRuleThickness
+ \vrule width #3 height -\dimen2 depth #2%
+ }%
+ \ZeroBoxOut{0}%
+ }%
+}
+\def\RulesOnSide #1#2#3{%
+ {%
+ \setbox 0 = \hbox{%
+ \ifBulletAndBaseLine
+ \copy\@BulletBox
+ \fi
+ \hskip -0.5\BoxRuleThickness
+ \vrule width \BoxRuleThickness height #1 depth #2%
+ \hskip #3%
+ \hskip -\BoxRuleThickness
+ \vrule width \BoxRuleThickness height #1 depth #2%
+ \hskip -#3%
+ \hskip -\BoxRuleThickness
+ \dimen0 = #3%
+ \advance\dimen0 by \BoxRuleThickness
+ \dimen2 = #1%
+ \advance\dimen2 by 0.5\BoxRuleThickness
+ \dimen4 = #1%
+ \advance\dimen4 by -0.5\BoxRuleThickness
+ \dimen4 = -\dimen4
+ \vrule width \dimen0 height \dimen2 depth \dimen4
+ \hskip -\dimen0
+ \dimen2 = #2%
+ \advance\dimen2 by -0.5\BoxRuleThickness
+ \dimen2 = -\dimen2
+ \dimen4 = #2%
+ \advance\dimen4 by 0.5\BoxRuleThickness
+ \vrule width \dimen0 height \dimen2 depth \dimen4
+ }%
+ \ZeroBoxOut{0}%
+ }%
+}
+\catcode`\@ = 12