A population can be productive.Logical formLearned from44 sentences. A means can be productive.Logical formLearned from44 sentences. A (labor force) can be productive.Logical formLearned from44 sentences. Technologies can be productive.Logical formLearned from44 sentences. An exercise can be productive.Logical formLearned from44 sentences. A technology can be productive.Logical formLearned from44 sentences. Discussions can be productive.Logical formLearned from44 sentences. A living can be productive.Logical formLearned from44 sentences. Sources can be productive.Logical formLearned from43 sentences. Some days can be productive.Logical formLearned from43 sentences. Varieties can be productive.Logical formLearned from43 sentences. A program can be productive.Logical formLearned from43 sentences. A round can be productive.Logical formLearned from43 sentences. Places can be productive.Logical formLearned from42 sentences. A space can be productive.Logical formLearned from42 sentences.