Prints shortestpath(No transfer / time depend) for subway in Seoul. when you can't get a path, then print 100count default. cause this is just a sub-function for subwayshortestpath().
shortestpath_0(depart, depart_line, arrival, arrival_line)
shortestpath_0(depart="먹골", depart_line="7", arrival="고속터미널", arrival_line="7")
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