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4. Given a plane graph represented as an ordered (clockwise) adjacency lists, as presented in class, give a detailed efficient algorithm that lists all regions of the plane embedding. Here each region is a sequence of vertices, ordered as one traverses the edges of its boundary. See the following 4 marks) example (CompSci220 format) 6 1 3 0 2 3 1 5 4 0 1 4 2 3 2 Ri: 0125243 Ro: 031 R3: 1342 R1 R2 4 Do analysis on the running-time of your algorithm. Note that all planar graphs have O(n) edges.

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