+\R{ 0pt}{ 0pt}\D\par
+\R{ 0pt}{10pt}\D\par
+\R{10pt}{ 0pt}\D\par
+\R{ 0pt}{10pt}\D\hfil\break
+\setbox0=\hbox{\D}\vrule width 20pt height 0.4pt depth 0pt
+\ltjsetparameter{yalbaselineshift=-10pt}
+abc\unhcopy0\vrule width 20pt height 0.4pt depth 0pt\par
+
+