The space station, Lupus-1, is an enormous spacecraft made up of three identical cylindrical structures that house the living quarters for the crew.   The three cylindrical structures are linked together by a series of tunnels that hold them together and allow the crew to move between cylinders.  Each cylindrical structure contains 12 bedrooms, 7 bathrooms, and several kitchens.  If the entire space station has 72 rooms, how many kitchens are there on the entire space station?
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