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defbasic_dfs(graph,startNode,goalNode): Performsadepth-firstsearchonagraphfromaspecifiedstart nodetoaspecifiedgoalnode,returningapath-to-goalifit exists,otherwisereturningNone. Usesbacktracking,butdoesnotuseanextendedset.
defbasic_dfs(graph,startNode,goalNode):
"""
Performsadepth-firstsearchonagraphfromaspecifiedstart
nodetoaspecifiedgoalnode,returningapath-to-goalifit
exists,otherwisereturningNone.
Usesbacktracking,butdoesnotuseanextendedset.
""
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