Relations may undergo maintenance.Logical formLearned from150 sentences. Vehicles may undergo maintenance.Logical formLearned from148 sentences. A responsibility can be for maintenance of international peace.Logical formLearned from144 sentences. An engineer can be from a (maintenance department).Logical formLearned from144 sentences. (Maintenance fees) can be annual.Logical formLearned from143 sentences. Maintenance may pertain-to a female.Logical formLearned from142 sentences. Maintenance can be seasonal.Logical formLearned from140 sentences. Maintenance can be simple.Logical formLearned from139 sentences. Aircraft may undergo maintenance.Logical formLearned from139 sentences. Maintenance can be effective.Logical formLearned from138 sentences. Life may undergo maintenance.Logical formLearned from137 sentences. Maintenance can be reduced.Logical formLearned from135 sentences. Biodiversity may undergo maintenance.Logical formLearned from130 sentences. (Effort requirement) may undergo maintenance.Logical formLearned from128 sentences. Infrastructure may undergo maintenance.Logical formLearned from127 sentences.