An operation can be safe.Logical formLearned from2 769 sentences. An operation may pertain-to persons.Logical formLearned from2 528 sentences. Operations can be overseas.Logical formLearned from2 524 sentences. An operation can be in a country.Logical formLearned from2 503 sentences. An operation can be efficient.Logical formLearned from2 387 sentences. Operations can be humanitarian.Logical formLearned from2 311 sentences. An operation may begin.Logical formLearned from2 272 sentences. An airport may have some (aircraft operations).Logical formLearned from2 103 sentences. An operation can be continued.Logical formLearned from2 022 sentences. A base can be constituted-of-or-filled-with operations.Logical formLearned from1 982 sentences. An operation can be smooth.Logical formLearned from1 928 sentences. An operation may pertain-to a weekday.Logical formLearned from1 822 sentences. Operations may pertain-to a person.Logical formLearned from1 734 sentences. A series can be constituted-of-or-filled-with operations.Logical formLearned from1 725 sentences. An operation may pertain-to a female.Logical formLearned from1 715 sentences.