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Code Listing by Fabio Gori

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This function contains the well known greedy algorithm for solving Set Cover problem (ChvdodAtal, 1979), with two small modifications:
* In case of more than one possible choice at a certain step, the biggest set is chosen;
* Once the solution is found, we check the selected sets to find a better cover solution, removing a set if is a subset of the union of the other set.

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