Schools may undergo maintenance.Logical formLearned from20 sentences. (Maintenance tasks) can be daily.Logical formLearned from20 sentences. Culture may undergo maintenance.Logical formLearned from20 sentences. Accidents may be blamed on maintenance.Logical formLearned from20 sentences. (Maintenance records) may pertain-to an aircraft.Logical formLearned from20 sentences. Maintenance may pertain-to a plane.Logical formLearned from20 sentences. (Power plants) may undergo maintenance.Logical formLearned from20 sentences. Relations may undergo maintenance.Logical formLearned from19 sentences. A sovereignty may undergo maintenance.Logical formLearned from19 sentences. Vessels may undergo maintenance.Logical formLearned from19 sentences. A state can be constituted-of-or-filled-with maintenance.Logical formLearned from19 sentences. Locomotives may undergo maintenance.Logical formLearned from19 sentences. (Maintenance problems) can be serious.Logical formLearned from19 sentences. Maintenance can be locomotive.Logical formLearned from19 sentences. Concerns may regard maintenance.Logical formLearned from19 sentences.