A virus can be aggressive.Logical formLearned from30 sentences. Some persons may be infected by a virus.Logical formLearned from30 sentences. A virus may undergo a prevention.Logical formLearned from29 sentences. Research can be on viruses.Logical formLearned from29 sentences. Persons can be with virus.Logical formLearned from29 sentences. A response can be to a virus.Logical formLearned from29 sentences. A virus may cause sars.Logical formLearned from29 sentences. Virus may spread.Logical formLearned from29 sentences. Laptops may be infected with a (computer virus).Logical formLearned from29 sentences. A virus may act.Logical formLearned from29 sentences. A virus can be unnamed.Logical formLearned from29 sentences. A virus can be a problem.Logical formLearned from29 sentences. A virus can be sore.Logical formLearned from29 sentences. A virus can be sober.Logical formLearned from29 sentences. Patients can be with a virus.Logical formLearned from29 sentences.