Prints shortestpath(time depend) for subway in Seoul also you can get a subway list in your path. when you can't get a path, you should consider another one. cause these function is just consider zero, one, two transfer count to find shortestpath for subway.
shortestpath(depart, depart_line, arrival, arrival_line)
shortestpath(depart="혜화", depart_line="4", arrival="아차산", arrival_line="5")
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