A device may operate on frequencies.Logical formLearned from61 sentences. Agencies may operate in a country.Logical formLearned from61 sentences. A station may be operated.Logical formLearned from60 sentences. The universe may operate.Logical formLearned from60 sentences. Some plants may operate.Logical formLearned from60 sentences. A cell may operate.Logical formLearned from60 sentences. Aircrafts may operate.Logical formLearned from60 sentences. Insurgents may operate.Logical formLearned from60 sentences. An international-political-entity may operate.Logical formLearned from60 sentences. A world-city may operate.Logical formLearned from59 sentences. Units may operate.Logical formLearned from59 sentences. Equipment may be operated.Logical formLearned from59 sentences. A male may operate a business.Logical formLearned from59 sentences. A commission may operate.Logical formLearned from59 sentences. Some reactors may operate.Logical formLearned from58 sentences.