\documentclass[titlepage,12pt]{article}

\usepackage{graphics}
\usepackage{epsfig}
\usepackage{ulem}
\usepackage{pstcol}
\usepackage{calc}
\usepackage{ifthen}
\usepackage{overcite}

\def\etal{{\it et al.}}
\def\eg{{\it e.g.}}
\def\microns{$\mu \mathrm{m}$}
\def\relationship{$a/b$ versus $D_{e}$ relationship}
\def\x{$x$}
\def\y{$y$}
\def\z{$z$}
\def\xy{$(x,y)$}
\def\xz{$(x,z)$}
\def\xyz{$(x,y,z)$}
\def\xyzd{$(x,y,z,d)$}
\def\xyzdbar{$(x,y,z,\overline{d})$}
\def\dbar{$\overline{d}$}
\def\bigspace{\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad}
\def\medspace{\quad\quad\quad\quad\quad\quad}
\def\spacer{\uline{\quad\quad\quad\quad}}

\textwidth=6.6in 
\textheight=9.1in 
\oddsidemargin=-0.0625in
\evensidemargin=-0.0625in 
\topmargin=-0.5in

\begin{document}


\psset{unit=2mm}
\thinlines
\begin{pspicture}(50,20)
\newcounter{XX}\setcounter{XX}{1}
\newcounter{YY}\setcounter{YY}{1}
\newcounter{XXp}\setcounter{XXp}{1}
\newcounter{YYp}\setcounter{YYp}{1}
\newcounter{bigXX}\setcounter{bigXX}{1}
\newcounter{bigXXp}\setcounter{bigXXp}{1}

% LHS
\whiledo{\value{YY}<21}
{%
\setcounter{YYp}{\value{YY}+1}
\setcounter{XX}{1}

	\whiledo{\value{XX}<21}
	{%
	\setcounter{XXp}{\value{XX}+1}
		\psframe[linecolor=black,fillstyle=solid,fillcolor=black]
		(\theXX,\theYY)(\theXXp,\theYYp)
	%
	\stepcounter{XX}
	}

%
\stepcounter{YY}
}

\setcounter{XX}{26}
\setcounter{YY}{1}

% RHS
\whiledo{\value{YY}<21}
{%
\setcounter{YYp}{\value{YY}+1}
\setcounter{XX}{26}

	\whiledo{\value{XX}<46}
	{%
	\setcounter{XXp}{\value{XX}+1}
		\psframe[linecolor=black,fillstyle=solid,fillcolor=black]
		(\theXX,\theYY)(\theXXp,\theYYp)
	%
	\stepcounter{XX}
	}

%
\stepcounter{YY}
}

% Make white pixels.
\setcounter{XX}{7}
\setcounter{XXp}{8}
\setcounter{YY}{5}
\setcounter{YYp}{6}

\whiledo{\value{XX}<15}
{%
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\theXX,\theYY)(\theXXp,\theYYp)
	\setcounter{bigXX}{\value{XX}+25}
	\setcounter{bigXXp}{\value{XXp}+25}
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\thebigXX,\theYY)(\thebigXXp,\theYYp)
	%
	\stepcounter{XX}
	\stepcounter{XXp}
}

\setcounter{XX}{7}
\setcounter{XXp}{8}
\setcounter{YY}{16}
\setcounter{YYp}{17}

\whiledo{\value{XX}<15}
{%
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\theXX,\theYY)(\theXXp,\theYYp)
	\setcounter{bigXX}{\value{XX}+25}
	\setcounter{bigXXp}{\value{XXp}+25}
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\thebigXX,\theYY)(\thebigXXp,\theYYp)
	%
	\stepcounter{XX}
	\stepcounter{XXp}
}


\setcounter{YY}{7}
\setcounter{YYp}{8}
\setcounter{XX}{5}
\setcounter{XXp}{6}

\whiledo{\value{YY}<15}
{%
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\theXX,\theYY)(\theXXp,\theYYp)
	\setcounter{bigXX}{\value{XX}+25}
	\setcounter{bigXXp}{\value{XXp}+25}
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\thebigXX,\theYY)(\thebigXXp,\theYYp)
	%
	\stepcounter{YY}
	\stepcounter{YYp}
}


\setcounter{YY}{7}
\setcounter{YYp}{8}
\setcounter{XX}{16}
\setcounter{XXp}{17}

\whiledo{\value{YY}<15}
{%
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\theXX,\theYY)(\theXXp,\theYYp)
	\setcounter{bigXX}{\value{XX}+25}
	\setcounter{bigXXp}{\value{XXp}+25}
	\psframe[linecolor=black,fillstyle=solid,fillcolor=white]
	(\thebigXX,\theYY)(\thebigXXp,\theYYp)
	%
	\stepcounter{YY}
	\stepcounter{YYp}
}


\psframe[linecolor=black,fillstyle=solid,fillcolor=white](6,6)(7,7)
\psframe[linecolor=black,fillstyle=solid,fillcolor=white](15,15)(16,16)
\psframe[linecolor=black,fillstyle=solid,fillcolor=white](31,6)(32,7)
\psframe[linecolor=black,fillstyle=solid,fillcolor=white](40,15)(41,16)

\psframe[linecolor=black,fillstyle=solid,fillcolor=white](6,15)(7,16)
\psframe[linecolor=black,fillstyle=solid,fillcolor=white](15,6)(16,7)
\psframe[linecolor=black,fillstyle=solid,fillcolor=white](31,15)(32,16)
\psframe[linecolor=black,fillstyle=solid,fillcolor=white](40,6)(41,7)


% Make two black pixels
\psframe[linecolor=black,fillstyle=solid,fillcolor=black](41,10)(42,11)
\psframe[linecolor=black,fillstyle=solid,fillcolor=black](41,11)(42,12)

\end{pspicture}

\end{document}