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(a) By taking the coverage distance (Dc) 19 for the grid given on the right, set up the set covering model for the secondary purpose of maximizing the demand points covered twice. (b) Solve the problem by applying column and row reduction techniques on the classical single-purpose set covering model of the same network. (c) If the facilities were also allowed to be built on branches, what would you do when modeling (do not build a model, state how you can build the model). 12 B 13 17 D E 16 14 20 F (a) By taking the coverage distance (Dc) 19 for the grid given on the right, set up the set covering model for the secondary purpose of maximizing the demand points covered twice. (b) Solve the problem by applying column and row reduction techniques on the classical single-purpose set covering model of the same network. (c) If the facilities were also allowed to be built on branches, what would you do when modeling (do not build a model, state how you can build the model). 12 B 13 17 D E 16 14 20 F