(Maintenance shutdowns) can be planned.Logical formLearned from12 sentences. Public security may undergo maintenance.Logical formLearned from12 sentences. Maintenance can be urban.Logical formLearned from11 sentences. A device may undergo maintenance.Logical formLearned from11 sentences. A responsibility can be for maintenance of (world peace).Logical formLearned from11 sentences. Tracks may undergo maintenance.Logical formLearned from11 sentences. A quality may undergo maintenance.Logical formLearned from11 sentences. Efficiency may undergo maintenance.Logical formLearned from11 sentences. Rolling stock may undergo maintenance.Logical formLearned from11 sentences. Traditions may undergo maintenance.Logical formLearned from11 sentences. Houses may undergo maintenance.Logical formLearned from11 sentences. A (ship maintenance facility) can be inactive.Logical formLearned from11 sentences. A fund may undergo maintenance.Logical formLearned from11 sentences. A monument may undergo maintenance.Logical formLearned from11 sentences. Maintenance can be substandard.Logical formLearned from11 sentences.