\begin{picture}(0,0)%
\special{psfile=2systems.pstex}%
\end{picture}%
\setlength{\unitlength}{0.007500in}%
%
\begingroup\makeatletter\ifx\SetFigFont\undefined
% extract first six characters in \fmtname
\def\x#1#2#3#4#5#6#7\relax{\def\x{#1#2#3#4#5#6}}%
\expandafter\x\fmtname xxxxxx\relax \def\y{splain}%
\ifx\x\y   % LaTeX or SliTeX?
\gdef\SetFigFont#1#2#3{%
  \ifnum #1<17\tiny\else \ifnum #1<20\small\else
  \ifnum #1<24\normalsize\else \ifnum #1<29\large\else
  \ifnum #1<34\Large\else \ifnum #1<41\LARGE\else
     \huge\fi\fi\fi\fi\fi\fi
  \csname #3\endcsname}%
\else
\gdef\SetFigFont#1#2#3{\begingroup
  \count@#1\relax \ifnum 25<\count@\count@25\fi
  \def\x{\endgroup\@setsize\SetFigFont{#2pt}}%
  \expandafter\x
    \csname \romannumeral\the\count@ pt\expandafter\endcsname
    \csname @\romannumeral\the\count@ pt\endcsname
  \csname #3\endcsname}%
\fi
\fi\endgroup
\begin{picture}(543,358)(85,425)
%\smash{\SetFigFont{7}{8.4}{rm}
\put(200,635){\makebox(0,0)[b]{$\ell_0\colon\ t<2$}}
\put(200,735){\makebox(0,0)[b]{$y := y+1$}}
\put(200,425){\makebox(0,0)[b]{\ctss\ $\Phi_1$}}
\put(200,770){\makebox(0,0)[b]{\dcla}}
\put(200,515){\makebox(0,0)[b]{$\ell_1\colon$}}
\put(535,770){\makebox(0,0)[b]{\dcla}}
\put(535,515){\makebox(0,0)[b]{$\ell_1\colon$}}
\put(535,735){\makebox(0,0)[b]{$(y,t)  := (y+1,0)$}}
\put(535,635){\makebox(0,0)[b]{$\ell_0\colon\ t<\frac{1}{2^{y+1}}$}}
\put(535,425){\makebox(0,0)[b]{\ctss\ $\Phi_2$}}
\end{picture}