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