{HEAD ~ a searching unit} to search the route information of {TAIL ~ the respective links} connected via the respective node corresponding to the starting position; and 
{ HEAD ~ a searching unit } to search the route information of { TAIL ~ the respective links } connected via the respective node corresponding to the starting position ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH