Helicopters can be operational.Logical formLearned from17 sentences. A margin can be operational.Logical formLearned from16 sentences. Operational control can be over armed forces.Logical formLearned from16 sentences. A battalion can be operational.Logical formLearned from16 sentences. Institutions can be operational.Logical formLearned from16 sentences. A railway can be operational.Logical formLearned from16 sentences. A (fighter squadron) can be operational.Logical formLearned from16 sentences. Planes can be operational.Logical formLearned from16 sentences. A complex can be operational.Logical formLearned from16 sentences. Runways can be operational.Logical formLearned from16 sentences. Airfields can be operational.Logical formLearned from16 sentences. Causes can be operational.Logical formLearned from16 sentences. (Forecast centers) can be operational.Logical formLearned from16 sentences. A gap can be operational.Logical formLearned from16 sentences. A scientist can be operational.Logical formLearned from16 sentences.