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The square of a directed graph $G=(V,E)$ is the graph $G^2=(V,E^2)$ such that $(u,v) \in E^2$ if and only $G$ contains a path with at most two edges between $u$ and $v$ .Describe efficient algorithms for computing $G^2$ and $G$ for both the adjacency list and adjacency-matrix representations of G. Analyze the running times of your algorithms.

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