# Question: Suppose in the original Grand Prix example that the routes

Suppose in the original Grand Prix example that the routes from plant 2 to region 1 and from plant 3 to region 3 are not allowed. How would you modify the original model (Figure 14.12) to rule out these routes? How would you modify the alternative model (Figure 14.17) to do so? Discuss the pros and cons of these two approaches.

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