A flow of workers may contribute to a growth of an (airline industry).Logical formLearned from9 sentences. A country may contribute troops to (peacekeeping operations).Logical formLearned from9 sentences. A crackdown may contribute to a decrease.Logical formLearned from9 sentences. A country may contribute to problems.Logical formLearned from9 sentences. An attitude may contribute to a lack of interest.Logical formLearned from9 sentences. A strike may contribute to a security of a country.Logical formLearned from9 sentences. Measures may contribute to (market stability).Logical formLearned from9 sentences. Scientists may contribute (missile expertise) to a country.Logical formLearned from9 sentences. Emissions may contribute to global temperatures.Logical formLearned from9 sentences. Countries may contribute troops to a force.Logical formLearned from9 sentences. Failure may contribute to tensions.Logical formLearned from9 sentences. Renovations may contribute to a collapse.Logical formLearned from9 sentences. Corporations may contribute to groups.Logical formLearned from9 sentences. Profit-taking may contribute to some selling.Logical formLearned from9 sentences. A warning may contribute to weakness.Logical formLearned from9 sentences.