\noindent
{%
\setbox1=\hbox{$\{1\}$}%
\pdfxform 1
\setbox2=\hbox{$\{$2:$<$F1:\pdfrefxform\pdflastxform$>\}$}%
\pdfxform 2
\setbox3=\hbox{$\{$3:$<$F2:\pdfrefxform2$>\}$}%
\pdfxform 3
\setbox4=\hbox{$\{$4:$<$F2:\pdfrefxform2$>\}$}%
\pdfxform 4
$<$F3:\pdfrefxform3$><$F4:\pdfrefxform4$>$%
}%
\par\noindent
{%
\setbox1=\hbox{$\{1\}$}%
\pdfxform 1
\setbox2=\vbox{$\{$2:$<$F1:\pdfrefxform\pdflastxform$>\}$}%
\pdfxform 2
\setbox3=\vbox{$\{$3:$<$F2:\pdfrefxform2$>\}$}%
\pdfxform 3
\setbox4=\vbox{$\{$4:$<$F2:\pdfrefxform2$>\}$}%
\pdfxform 4
$<$F3:\pdfrefxform3$><$F4:\pdfrefxform4$>$%
}%
\vfill\eject
X
\setbox1=\hbox{$\{1\}$}%
\pdfxform 1
\setbox2=\vbox{$\{$2:$<$F1:\pdfrefxform\pdflastxform$>\}$}%
\pdfxform 2
\setbox3=\vbox{$\{$3:$<$F2:\pdfrefxform2$>\}$}%
\pdfxform 3
\setbox4=\vbox{$\{$4:$<$F2:\pdfrefxform2$>\}$}%
\pdfxform 4
$<$F3:\pdfrefxform3$><$F4:\pdfrefxform4$>$%
\end