Hours can be productive.Logical formLearned from180 sentences. A life can be productive.Logical formLearned from175 sentences. Adults can be productive.Logical formLearned from171 sentences. Results can be productive.Logical formLearned from169 sentences. Regions can be productive.Logical formLearned from168 sentences. Powers can be productive.Logical formLearned from168 sentences. A society can be productive.Logical formLearned from168 sentences. Farms can be productive.Logical formLearned from165 sentences. Research can be productive.Logical formLearned from164 sentences. A region can be productive.Logical formLearned from162 sentences. Cooperation can be productive.Logical formLearned from161 sentences. Systems can be productive.Logical formLearned from160 sentences. Ones can be productive.Logical formLearned from159 sentences. Tasks can be productive.Logical formLearned from156 sentences. Meetings can be productive.Logical formLearned from155 sentences.