A company may operate a vessel.Logical formLearned from6 sentences. An airline may operate some aircrafts.Logical formLearned from6 sentences. Some departments may operate in an absence of a budget.Logical formLearned from6 sentences. (Rail service) may operate.Logical formLearned from6 sentences. A (police force) may operate.Logical formLearned from6 sentences. Some (oil firms) may operate in a country.Logical formLearned from6 sentences. Guerrillas may operate in mountains.Logical formLearned from6 sentences. Some enterprises may operate at a loss.Logical formLearned from6 sentences. A person may operate on a president.Logical formLearned from6 sentences. Radios may operate on frequencies.Logical formLearned from6 sentences. (Guerrilla groups) may operate for years.Logical formLearned from5 sentences. Companies may operate in areas.Logical formLearned from5 sentences. A company may operate a terminal.Logical formLearned from5 sentences. Insurgents may operate in areas.Logical formLearned from5 sentences. Services may be operated by a railway-bureau.Logical formLearned from5 sentences.