Research can be productive.Logical formLearned from17 sentences. Effects can be productive.Logical formLearned from17 sentences. A person may remain productive.Logical formLearned from17 sentences. An element can be productive.Logical formLearned from17 sentences. Productive forces can be developed.Logical formLearned from16 sentences. Associations can be productive.Logical formLearned from16 sentences. A workshop can be productive.Logical formLearned from16 sentences. Economic sectors can be productive.Logical formLearned from16 sentences. A spring can be productive.Logical formLearned from16 sentences. Works can be productive.Logical formLearned from16 sentences. Funds can be productive.Logical formLearned from16 sentences. A training can be productive.Logical formLearned from16 sentences. A productive capacity may pertain-to a country.Logical formLearned from16 sentences. Workforces can be productive.Logical formLearned from16 sentences. Seas can be productive.Logical formLearned from16 sentences.