An operation can be periodic.Logical formLearned from17 sentences. (State laws) may undergo an operation.Logical formLearned from17 sentences. An operation may be used.Logical formLearned from17 sentences. A (covert operation) may pertain-to a country.Logical formLearned from17 sentences. A (labor market) may undergo an operation.Logical formLearned from17 sentences. Operations can be against persons.Logical formLearned from17 sentences. Operations may be located in a country.Logical formLearned from17 sentences. Operations may unite persons.Logical formLearned from17 sentences. Valves may undergo an operation.Logical formLearned from17 sentences. An operation can be proven.Logical formLearned from17 sentences. (Handling operations) can be manual.Logical formLearned from17 sentences. A grace may undergo an operation.Logical formLearned from17 sentences. A time may be required for an operation.Logical formLearned from17 sentences. A state can be constituted-of-or-filled-with operation.Logical formLearned from17 sentences. (Livestock operations) can be concentrated.Logical formLearned from17 sentences.