A surgeon may operate on a patient.Logical formLearned from15 sentences. Trains may operate at speed.Logical formLearned from15 sentences. (Security firms) may operate in a country.Logical formLearned from15 sentences. Inspectors may operate.Logical formLearned from15 sentences. Tubes may operate.Logical formLearned from15 sentences. Unmanned aircrafts may be operated by a government-agency.Logical formLearned from15 sentences. Troops may operate in areas.Logical formLearned from15 sentences. A nuclear reactor may operate.Logical formLearned from15 sentences. Some hospitals may operate.Logical formLearned from15 sentences. Provocations may operate in a camp.Logical formLearned from15 sentences. Newspaper may operate.Logical formLearned from15 sentences. Personnel may operate in waters.Logical formLearned from15 sentences. A (passenger plane) may be operated by a (budget airline).Logical formLearned from15 sentences. (Army forces) may operate with advisers.Logical formLearned from15 sentences. A mechanism may be operated by pygmies.Logical formLearned from15 sentences.