A person may contribute some percent.Logical formLearned from13 sentences. Artists may contribute.Logical formLearned from13 sentences. Some (member states) may contribute.Logical formLearned from13 sentences. Gas may contribute to global warming.Logical formLearned from13 sentences. Factors may contribute to health.Logical formLearned from13 sentences. Volunteers may contribute.Logical formLearned from13 sentences. Trade may contribute.Logical formLearned from13 sentences. Pollutants may contribute to smog.Logical formLearned from13 sentences. Persons may contribute to a discussion.Logical formLearned from13 sentences. Programs may contribute.Logical formLearned from13 sentences. Some factors may contribute to a failure.Logical formLearned from13 sentences. A person may contribute to charities.Logical formLearned from13 sentences. Faculty may contribute.Logical formLearned from13 sentences. Others may contribute.Logical formLearned from13 sentences. Efforts may contribute.Logical formLearned from13 sentences.