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Given:
1) A set of Departments and a matrix of traffic between departments,
2) A set of Locations and a matrix of distances betweeen locations,

Assign Departments to Locations, at most one department per location,
so as to minimize total traffic*distance cost of the assignment.
The "Departments" might be flights at at airport,
The "Traffic" might be transfers between flights,
The "Departments" might be gates at the terminal.