<>I wonder how the number of the node is defined in the figure III in Part II? For instance, It seems that there are three highways at the node 3 if we consider the number as the degree in graph theory. If not, there are two at node 3. Similarly, there are 4 highways in node 4. But 2 in the latter estimation. </P>
<>If the former is right, how the situation of node 1 is considered. Two highways are not connected to the nodes mentioned in the map. Furthermore, one of them is very short. Does it cout as one? </P>
<>If the latter is rational, all the nodes are connected to two highways. It is obvious not appropriate. </P>
<P>Thank, </P>