Operations can be valid.Logical formLearned from17 sentences. Operations can be derivative.Logical formLearned from17 sentences. An international-political-entity may launch operation.Logical formLearned from17 sentences. Some operations may continue.Logical formLearned from17 sentences. A club may cease operations.Logical formLearned from17 sentences. An operation may undergo complications.Logical formLearned from17 sentences. Operation may be planned.Logical formLearned from17 sentences. Operations may be established.Logical formLearned from17 sentences. Operations can be in 1970s.Logical formLearned from17 sentences. An operation can be recursive.Logical formLearned from17 sentences. An operation may start in a month.Logical formLearned from17 sentences. A (broadcast station) may undergo an operation.Logical formLearned from17 sentences. A (radio operation) can be unlicensed.Logical formLearned from17 sentences. An operation may undergo a monitoring.Logical formLearned from17 sentences. An operation may undergo a certification.Logical formLearned from17 sentences.