Programs may undergo maintenance.Logical formLearned from61 sentences. Peace may undergo maintenance.Logical formLearned from60 sentences. A backlog can be constituted-of-or-filled-with maintenance.Logical formLearned from60 sentences. A cost may pertain-to maintenance.Logical formLearned from60 sentences. Maintenance can be on vehicles.Logical formLearned from60 sentences. Property may undergo maintenance.Logical formLearned from59 sentences. Standards may undergo maintenance.Logical formLearned from59 sentences. (Maintenance activities) can be preventive.Logical formLearned from59 sentences. Services may undergo maintenance.Logical formLearned from58 sentences. Maintenance may be required.Logical formLearned from58 sentences. A program may undergo maintenance.Logical formLearned from58 sentences. A park may undergo maintenance.Logical formLearned from58 sentences. Biological diversity may undergo maintenance.Logical formLearned from58 sentences. Balance may undergo maintenance.Logical formLearned from57 sentences. Maintenance can be on equipment.Logical formLearned from57 sentences.