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Example

$\psfig{figure=figures/f18-12.ps}$

$\begin{displaymath}W \;=\; D^{(0)} \;=\; \left[ \begin{array}{cccc} 0 & 3 & \inf... ... \\ {\rm NIL} & 4 & {\rm NIL} & {\rm NIL} \end{array} \right]\end{displaymath}$

$\begin{displaymath}D^{(1)} \;=\; \left[ \begin{array}{cccc} 0 & 3 & \infty & 1 \... ... \\ {\rm NIL} & 4 & {\rm NIL} & {\rm NIL} \end{array} \right]\end{displaymath}$

$\begin{displaymath}D^{(2)} \;=\; \left[ \begin{array}{cccc} 0 & 3 & \infty & 1 \... ... \\ {\rm NIL} & 4 & {\rm NIL} & {\rm NIL} \end{array} \right]\end{displaymath}$

$\begin{displaymath}D^{(3)} \;=\; \left[ \begin{array}{cccc} 0 & 3 & \infty & 1 \... ... \\ {\rm NIL} & 4 & {\rm NIL} & {\rm NIL} \end{array} \right]\end{displaymath}$

$\begin{displaymath}D^{(4)} \;=\; \left[ \begin{array}{cccc} 0 & 2 & \infty & 1 \... ... \\ {\rm NIL} & 4 & {\rm NIL} & {\rm NIL} \end{array} \right]\end{displaymath}$

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