(Lung disease) may contribute.Logical formLearned from15 sentences. A person may contribute thoughts.Logical formLearned from15 sentences. A person may contribute to a household.Logical formLearned from15 sentences. A male may contribute a season.Logical formLearned from15 sentences. Employees may contribute to operations.Logical formLearned from15 sentences. Speculation may contribute to (energy prices).Logical formLearned from15 sentences. Everyone may contribute ideas.Logical formLearned from15 sentences. A (carbon dioxide) may contribute to global warming.Logical formLearned from15 sentences. (Home prices) may contribute to an urgency.Logical formLearned from15 sentences. Actions may contribute to a death.Logical formLearned from15 sentences. Genes may contribute to disease.Logical formLearned from15 sentences. A newspaper may contribute to an article.Logical formLearned from15 sentences. Activities may contribute to a value.Logical formLearned from15 sentences. Innovations may contribute to developments.Logical formLearned from15 sentences. Numbers may contribute to upkeep of pensioners.Logical formLearned from15 sentences.