the neighboring nodes in this set, then which two should we select?
From the first sight, we should make the selection from Nodes D,
E and F because they all have the maximum number of individual
node degree (6 node degrees). However, these three nodes share
the same neighboring nodes and select any two nodes from these
three nodes will not increase their neighboring nodes. Nevertheless,
though node I only has 5 nodes, the set of node I and node E has
8 neighboring nodes, which ismore than the number of neighboring
nodes formed by the set of Node D and Node E (Fig. 1)