28 косточек домино уложены в прямоугольник $7\times8$. Границы косточек
не изображены. Требуется восстановить их. $$
\def\-#1{\hskip6pt\mathclap{#1}\hskip6pt}
\colsep{0pt}{
\text{а)}\quad\begin{array}{|ccccccc|}
\hline
\-3&\-2&\-6&\-5&\-1&\-2&\-0\\
\-2&\-1&\-5&\-4&\-5&\-4&\-5\\
\-0&\-0&\-1&\-3&\-6&\-4&\-6\\
\-0&\-5&\-5&\-3&\-4&\-4&\-0\\
\-5&\-3&\-0&\-0&\-2&\-5&\-6\\
\-4&\-0&\-3&\-2&\-6&\-6&\-6\\
\-2&\-4&\-6&\-4&\-1&\-3&\-3\\
\-2&\-2&\-1&\-1&\-1&\-1&\-3\\
\hline
\end{array}
\qquad
\text{б)}\quad\begin{array}{|ccccccc|}
\hline
\-4&\-3&\-1&\-3&\-5&\-5&\-5\\
\-3&\-0&\-6&\-1&\-5&\-0&\-4\\
\-0&\-0&\-4&\-2&\-0&\-1&\-5\\
\-5&\-3&\-2&\-2&\-1&\-6&\-2\\
\-0&\-4&\-4&\-4&\-2&\-5&\-4\\
\-1&\-6&\-5&\-6&\-4&\-1&\-1\\
\-0&\-3&\-6&\-6&\-3&\-1&\-2\\
\-0&\-3&\-6&\-6&\-3&\-2&\-2\\
\hline
\end{array}}
$$
