\def\ltshframe #1#2#3#4{\vbox{\hrule height #1pt% \hbox{\vrule width #1pt\kern 0pt% \vbox{\kern0pt\frame{.3}{#2}{#3}{#4}\kern-#1pt% \kern-.3pt}% \kern-#1pt\vrule width 0pt}% \hrule height 0pt}}% \ltshframe{4}{5}{23pc}{\box4}