\def\rbshframe #1#2#3#4{\vbox{\hrule height 0pt% \hbox{\vrule width 0pt\kern -#1pt% \vbox{\kern-#1pt\frame{.3}{#2}{#3}{#4}% \kern-.3pt}% \kern 0pt\vrule width #1pt}% \hrule height #1pt}}% \rbshframe{4}{10}{23pc}{\box4}