A carcinogen can be harmful.Logical formLearned from4 sentences. Increases can be harmful.Logical formLearned from4 sentences. Marijuanas can be harmful.Logical formLearned from4 sentences. (Automobile emissions) can be harmful.Logical formLearned from4 sentences. A link can be harmful.Logical formLearned from4 sentences. Use of hydrocarbons can be harmful.Logical formLearned from4 sentences. A life can be harmful.Logical formLearned from4 sentences. Play can be harmful for a child.Logical formLearned from4 sentences. Humans can be harmful to an ecosystem.Logical formLearned from4 sentences. Relatives can be harmful.Logical formLearned from4 sentences. Dieting can be harmful.Logical formLearned from4 sentences. Greenhouse-gas emissions may prove harmful.Logical formLearned from4 sentences. Services can be harmful.Logical formLearned from4 sentences. Materials can be harmful to an environment.Logical formLearned from4 sentences. A medical condition can be harmful.Logical formLearned from4 sentences.