\documentclass[crop,tikz]{standalone}
\input{common-headers}

\begin{document}

\newcommand{\common}{%
  \coordinate (ll) at (-1cm,-1cm);
  \coordinate (ur) at (3cm, 3cm);
  \draw (ll) rectangle (ur);
  \clip (ll)+(0.1cm,0.1cm) rectangle ([shift={(-0.1cm,-0.1cm)}]ur);
}

\begin{tikzpicture}[
  every node/.style={draw, black!30, inner sep=0cm,
    minimum width=10pt, minimum height=10pt},
  cell/.style={black,fill=black},
  neig/.style={black}]
  \common

  \node       (h1) at (0,2) {};
  \node[neig] (h2) at (1,2) {};
  \node       (h3) at (2,2) {};

  \node[neig] (m1) at (0,1) {};
  \node[cell] (m2) at (1,1) {};
  \node[neig] (m3) at (2,1) {};

  \node       (b1) at (0,0) {};
  \node[neig] (b2) at (1,0) {};
  \node       (b3) at (2,0) {};
  
  \draw (m2) -- (h2);
  \draw (m2) -- (m1);
  \draw (m2) -- (m3);
  \draw (m2) -- (b2);
\end{tikzpicture}

\begin{tikzpicture}[
  every node/.style={draw, black!30, inner sep=0cm,
    minimum width=10pt, minimum height=10pt},
  cell/.style={black,fill=black},
  neig/.style={black}]
  \common

  \node       (h1) at (0,2) {};
  \node[neig] (h2) at (1,2) {};
  \node[neig] (h3) at (2,2) {};

  \node[neig] (m1) at (0,1) {};
  \node[cell] (m2) at (1,1) {};
  \node[neig] (m3) at (2,1) {};

  \node[neig] (b1) at (0,0) {};
  \node[neig] (b2) at (1,0) {};
  \node       (b3) at (2,0) {};
  
  \draw (m2) -- (h2);
  \draw (m2) -- (m1);
  \draw (m2) -- (m3);
  \draw (m2) -- (b2);
  \draw (m2) -- (b1);
  \draw (m2) -- (h3);
\end{tikzpicture}

\begin{tikzpicture}[
  every node/.style={draw, black!30, inner sep=0cm,
    minimum width=10pt, minimum height=10pt},
  cell/.style={black,fill=black},
  neig/.style={black}]
  \common

  \node[neig] (h1) at (0,2) {};
  \node[neig] (h2) at (1,2) {};
  \node[neig] (h3) at (2,2) {};

  \node[neig] (m1) at (0,1) {};
  \node[cell] (m2) at (1,1) {};
  \node[neig] (m3) at (2,1) {};

  \node[neig] (b1) at (0,0) {};
  \node[neig] (b2) at (1,0) {};
  \node[neig] (b3) at (2,0) {};
  
  \draw (m2) -- (m1);
  \draw (m2) -- (m3);
  \draw (m2) -- (b1);
  \draw (m2) -- (b2);
  \draw (m2) -- (b3);
  \draw (m2) -- (h1);
  \draw (m2) -- (h2);
  \draw (m2) -- (h3);
\end{tikzpicture}
\end{document}