Question: (Pre- and Post- Order Correspondence, Suppose that for a graph G you are given the list of the pre-order numbers of its n vertices and

(Pre- and Post- Order Correspondence, Suppose that for a graph G you are given the list of the pre-order numbers of its n vertices and the list of the post-order numbers of its n vertices. Show that it is possible to determine which pre-order numbers correspond to which post-order numbers (in terms of being the pre- and post-order numbers for the same vertex).

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