rvncerr

% Tesseract.
\begin{center}
\begin{picture}(200,225)
\linethickness{1mm}
\thicklines

\put(25,225){\circle*{5}}
\put(100,225){\circle*{5}}
\put(0,200){\circle*{5}}
\put(75,200){\circle*{5}}