A problem can be constituted-of-or-filled-with (water pollution).Logical formLearned from4 sentences. A country may face a problem of (water pollution).Logical formLearned from4 sentences. (Water pollution) may be caused by fertilizers.Logical formLearned from4 sentences. Pollution can be to workers.Logical formLearned from4 sentences. (Snow coaches) may reduce pollution.Logical formLearned from4 sentences. A decision may depend on meeting (pollution controls).Logical formLearned from4 sentences. A fight can be against a form of pollution.Logical formLearned from4 sentences. (Pollution cuts) may slow an economic growth that something-is-the-case.Logical formLearned from4 sentences. Smoke may cause (air pollution).Logical formLearned from4 sentences. Contaminated water may be caused by pollution.Logical formLearned from4 sentences. Pollution may be caused by oil.Logical formLearned from4 sentences. Pollution can be from a (chemical plant).Logical formLearned from4 sentences. Pollution may be caused by heat.Logical formLearned from4 sentences. A spike can be in (ozone pollution).Logical formLearned from4 sentences. A problem of (water pollution) may remain severe.Logical formLearned from4 sentences.