Persons may operate for some years.Logical formLearned from21 sentences. Some agencies may operate.Logical formLearned from21 sentences. Components may operate.Logical formLearned from21 sentences. A postal-service may operate.Logical formLearned from21 sentences. A general may operate.Logical formLearned from21 sentences. Industries may operate.Logical formLearned from21 sentences. A machine may be operated.Logical formLearned from21 sentences. Persons may operate in a market.Logical formLearned from21 sentences. A company may operate a service.Logical formLearned from21 sentences. (Military aircrafts) may operate.Logical formLearned from21 sentences. A person may operate an (anonymity service).Logical formLearned from21 sentences. A company may operate airport.Logical formLearned from21 sentences. Persons may operate a system.Logical formLearned from21 sentences. A provision may operate.Logical formLearned from21 sentences. Companies may be operated.Logical formLearned from21 sentences.