The iterations of the algorithm are summarized in Figure 6.7. The thin arcs provide all the candidate links between C and C. The thick branches represent the permanent links between the
nodes of the connected set c: and the dashed branch represents the new (permanent) link added
at each iteration. For example, in iteration 1, branch (1,2) is the shortest link (= 1 mile) among
aU the candidate branches from node 1 to nodes 2,3,4,5, and 6 of the unconnected set C.
Hence, link (1,2) is made permanent and t = 2, which yields