'Checks whether `n1` post-dominates `n2` in the *original* (not reversed) graph.
:param networkx.DiGraph reversed_graph:  The reversed networkx.DiGraph instance.
:param networkx.Node n1:                 Node 1.
:param networkx.Node n2:                 Node 2.
:returns bool:                           True/False.'

@staticmethod
def _post_dominate(reversed_graph, n1, n2):

    ds = networkx.dominating_set(reversed_graph, n1)
    return (n2 in ds)
