user: Question: How many capacities are possible for the 1.6 Duratec model/engine?
Columns: ['Model/Engine', 'Capacity', 'Cylinders/Valves', 'Power/rpm', 'Torque (Nm)/rpm']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1.6 Duratec', '1,596 cc', '4/16', 'hp (kW; PS) @6000', 'N·m (lb·ft) @4000']
SQL:

assistant: SELECT COUNT("Capacity") FROM "Table" WHERE "Model/Engine" = '1.6 Duratec';