\begin{eqnarray*}
s_{ij} = \left\{ \begin{array}{lcl}
9 & \text{if} & i = j \\
8 & \text{if} & 1 \le | i - j | \le 3 \\
7 & \text{if} & 4 \le | i - j | \le 6 \\
 & \cdots & \\
1 & \text{if} & 22 \le | i - j | \le 24 \\
0 & \text{if} & | i - j | \ge 25 \\
\end{array} \right.
\end{eqnarray*}
