\begin{figure}[htbp]
\caption{A $3 \times 4$ 9-point grid with its adjacency structure}
\label{fig:3x4-grid}
\begin{center}
\begin{minipage}{1 in}
\setlength{\unitlength}{0.40 cm}
\begin{picture}(10,10)
%  \multiput(1,1)(0,2){4}{
%     \multiput(1,1)(2,0){3}{$\bullet$}
%  }
%  \multiput(1,1)(0,2){4}{
%     \put(1.1,1.4){\line(1,0){4}}
%  }
%  \multiput(1,1)(2,0){3}{
%     \put(1.35,1.1){\line(0,1){6}}
%  }
   \put(1.35,1.0){\line(1,0){1.25}}
   \put(3.35,1.0){\line(1,0){1.25}}
   \put(1.35,3.0){\line(1,0){1.25}}
   \put(3.35,3.0){\line(1,0){1.25}}
   \put(1.35,5.0){\line(1,0){1.25}}
   \put(3.35,5.0){\line(1,0){1.25}}
   \put(1.35,7.0){\line(1,0){1.25}}
   \put(3.35,7.0){\line(1,0){1.25}}
   \put(1.00,1.5){\line(0,1){1.00}}
   \put(3.00,1.5){\line(0,1){1.00}}
   \put(5.00,1.5){\line(0,1){1.00}}
   \put(1.00,3.5){\line(0,1){1.00}}
   \put(3.00,3.5){\line(0,1){1.00}}
   \put(5.00,3.5){\line(0,1){1.00}}
   \put(1.00,5.5){\line(0,1){1.00}}
   \put(3.00,5.5){\line(0,1){1.00}}
   \put(5.00,5.5){\line(0,1){1.00}}
   \put(1,1){\makebox(0,0){0}}
   \put(3,1){\makebox(0,0){1}}
   \put(5,1){\makebox(0,0){2}}
   \put(1,3){\makebox(0,0){3}}
   \put(3,3){\makebox(0,0){4}}
   \put(5,3){\makebox(0,0){5}}
   \put(1,5){\makebox(0,0){6}}
   \put(3,5){\makebox(0,0){7}}
   \put(5,5){\makebox(0,0){8}}
   \put(1,7){\makebox(0,0){9}}
   \put(3,7){\makebox(0,0){10}}
   \put(5,7){\makebox(0,0){11}}
\end{picture}
\end{minipage}
\qquad
\begin{minipage}{4 in}
\begin{verbatim}
 IVL : integer vector list object :
 type 1, chunked storage
 12 lists, 12 maximum lists, 70 tsize, 4240 total bytes
 1 chunks, 70 active entries, 1024 allocated, 6.84 % used
     0 : 0 1 3 4
     1 : 0 1 2 3 4 5
     2 : 1 2 4 5
     3 : 0 1 3 4 6 7
     4 : 0 1 2 3 4 5 6 7 8
     5 : 1 2 4 5 7 8
     6 : 3 4 6 7 9 10
     7 : 3 4 5 6 7 8 9 10 11
     8 : 4 5 7 8 10 11
     9 : 6 7 9 10
    10 : 6 7 8 9 10 11
    11 : 7 8 10 11
\end{verbatim}
\end{minipage}
\end{center}
\end{figure}
