Find the shortest ancestral path between v and w given a DAG and two vertices, v and w. A common ancestor x, the shortest route from v to x, and the shortest route from w to x make up an ancestral path between v and w. The ancestral path whose overall length is minimised is the shortest ancestral path. Find a DAG where a common ancestor x is reached via the shortest ancestral path that does not lead to an LCA. Run BFS twice, from both v and w, as a hint.

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