A retaliation may contribute to calmings of clashes.Logical formLearned from14 sentences. A company may contribute.Logical formLearned from14 sentences. Students may contribute to research.Logical formLearned from14 sentences. Deforestation may contribute to disasters.Logical formLearned from14 sentences. (Nitrogen oxide) may contribute to smog.Logical formLearned from14 sentences. A person may contribute a part.Logical formLearned from14 sentences. Youths may contribute to a crush of revelers.Logical formLearned from14 sentences. A (junk food) may contribute to obesity.Logical formLearned from14 sentences. A country may contribute some percent of a fund.Logical formLearned from14 sentences. Some companies may contribute.Logical formLearned from14 sentences. Exports may contribute to growth.Logical formLearned from14 sentences. Some nations may contribute.Logical formLearned from14 sentences. A country may contribute troops to a force.Logical formLearned from14 sentences. Some countries may contribute to a force.Logical formLearned from14 sentences. A person may contribute to a female.Logical formLearned from13 sentences.