Some (rebel groups) may operate in a region.Logical formLearned from6 sentences. Refiners may operate.Logical formLearned from6 sentences. Some carriers may operate flights.Logical formLearned from6 sentences. The canadian economy may operate.Logical formLearned from6 sentences. (Oil firms) may operate.Logical formLearned from6 sentences. A company may operate some flights.Logical formLearned from6 sentences. An airline may operate some 737s.Logical formLearned from6 sentences. A judicial system may operate in a democratic society.Logical formLearned from6 sentences. Administrations may operate on an assumption.Logical formLearned from6 sentences. Terrorists may operate on soil.Logical formLearned from6 sentences. A mafia may operate.Logical formLearned from6 sentences. An airline may operate some services.Logical formLearned from6 sentences. Others may operate at capacity.Logical formLearned from6 sentences. A (field hospital) may operate on a soldier.Logical formLearned from6 sentences. A military-or-other-action-organization may operate prisons.Logical formLearned from6 sentences.