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r� r r r r r� 6 s r� c sJ t ���t� �t� �g �� ����fdd�� xt| �D ] }� |� q6W �S )a� Topologically sort based on a user provided edge definition.
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graph: A list of node names.
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graph = {'a': '$(b) $(c)', 'b': 'hi', 'c': '$(b)'}
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print(TopologicallySorted(graph.keys(), GetEdges))
==>
['a', 'c', b']
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