Valleys can be closed.Logical formLearned from6 sentences. An economy can be closed.Logical formLearned from6 sentences. A ramp can be closed.Logical formLearned from6 sentences. A closed system can be proprietary.Logical formLearned from6 sentences. The economy may remain closed to competition.Logical formLearned from6 sentences. A connection to a client can be closed.Logical formLearned from6 sentences. A regulatory system can be closed.Logical formLearned from6 sentences. A closed system may mean that something-is-the-case.Logical formLearned from6 sentences. An element can be closed.Logical formLearned from6 sentences. An avenue can be closed.Logical formLearned from6 sentences. (Aquaculture systems) can be closed.Logical formLearned from6 sentences. Bays can be closed.Logical formLearned from6 sentences. A (discussion forum) can be closed.Logical formLearned from6 sentences. A surgery can be closed.Logical formLearned from6 sentences. Some connections can be closed.Logical formLearned from6 sentences.