\documentstyle[12pt]{article}
\oddsidemargin=18mm
\evensidemargin=18mm
\textwidth=135mm
\topmargin=0mm
\textheight=220mm
\begin{document}
\thispagestyle{empty}
\newcommand{\hs}{\hspace*}
\newcommand{\fns}{\footnotesize}
\newcommand{\hugeskip}{\vspace*{10mm}\noindent}
\newcommand{\N}{\sim \!\!}
\newcommand{\C}{\!\rightarrow\!}
\newcommand{\CC}{\,\rightarrow\,}
\newcommand{\Cdot}{\,\rightarrow\!.\;}
\newcommand{\K}{\;\&\;}
\newcommand{\mt}{\mbox{{\fns $\wedge$}}}
\newcommand{\A}{\mbox{$\,${\fns $\vee$}$\,$}}
\newcommand{\fs}{\circ}
\newcommand{\imp}{\:\Longrightarrow\:}
\newcommand{\spt}{\raisebox{0.25ex}{$\bullet$}}
\newcommand{\Leq}{\raisebox{1pt}{{\small $\;\leq\;$}}}
\newcommand{\PW}{{\bf P$-$W}}
\newcommand{\Df}{\:\:=\!\mbox{df}\,\:\:}
\newcommand{\Mc}{M\raisebox{3pt}{c}}
\newcommand{\I}{\"{\i}}
\def\Dt#1,#2 {\put(#1,#2){\circle*{0.4}}}
\def\Ln#1,#2,#3,#4 {\put(#1,#2){\line(#3,#4){2}}}
\def\Diamond#1,#2 {\put(#1,#2){\begin{picture}(0,0)(0,0)
  \Dt 2,0 \Dt -2,0 \Dt 0,2 \Dt 0,-2
  \Ln -2,0,1,1 \Ln -2,0,1,-1 \Ln 2,0,-1,1 \Ln 2,0,-1,-1
\end{picture}}}
\def\Boxx#1,#2 {\put(#1,#2){\begin{picture}(0,0)(0,0)
  \Diamond 0,1 \Diamond 0,-1
  \Ln 0,1,0,1 \Ln 0,-1,0,-1 \Ln -2,-1,0,1 \Ln 2,-1,0,1
\end{picture}}}
 
\thicklines
\setlength{\unitlength}{6mm}

.
