Exchanges may be closed.Logical formLearned from15 sentences. A (currency exchange) may pertain-to a country.Logical formLearned from15 sentences. Exchange can be for hosting a (missile defense base).Logical formLearned from15 sentences. Knowledge may pertain-to an exchange.Logical formLearned from15 sentences. Persons may have an exchange of information.Logical formLearned from15 sentences. A (currency exchange rate) can be favorable.Logical formLearned from15 sentences. Exchange can be for a halt to military operations.Logical formLearned from15 sentences. Exchanges can be full-fledged.Logical formLearned from15 sentences. A stock can be on an exchange.Logical formLearned from15 sentences. Some prisoners may be freed in exchange.Logical formLearned from15 sentences. Exchanges can be between some allies.Logical formLearned from15 sentences. (Share prices) can be on a german (stock exchange).Logical formLearned from15 sentences. Concerns can be about (exchange rates).Logical formLearned from15 sentences. An exchange can be between some pilots.Logical formLearned from15 sentences. Spokesman can be for an exchange.Logical formLearned from15 sentences.