A staff may contribute.Logical formLearned from10 sentences. Some factors may contribute to obesity.Logical formLearned from10 sentences. Research may contribute to an understanding.Logical formLearned from10 sentences. A number of factors may contribute to an increase.Logical formLearned from10 sentences. A male may contribute to a death.Logical formLearned from10 sentences. Persons may contribute ideas.Logical formLearned from10 sentences. Salt may contribute to high (blood pressure).Logical formLearned from10 sentences. A person may contribute from a world-city.Logical formLearned from10 sentences. (Regulatory failures) may contribute to a crisis.Logical formLearned from10 sentences. Canadian governments may contribute financing.Logical formLearned from10 sentences. A male may contribute music.Logical formLearned from10 sentences. A US-president may contribute to a problem.Logical formLearned from10 sentences. A dollar may contribute to a sell-off.Logical formLearned from10 sentences. A revolt may contribute to a (security situation).Logical formLearned from10 sentences. Concerns may contribute to a run-up.Logical formLearned from10 sentences.