Viruses may undergo a development.Logical formLearned from56 sentences. A virus may reproduce.Logical formLearned from56 sentences. Infection can be by (computer virus).Logical formLearned from56 sentences. Hundreds can be constituted-of-or-filled-with viruses.Logical formLearned from56 sentences. A virus can be enough.Logical formLearned from56 sentences. A wave may pertain-to a virus.Logical formLearned from56 sentences. A case can be constituted-of-or-filled-with virus.Logical formLearned from56 sentences. Origins may pertain-to a virus.Logical formLearned from55 sentences. Viruses may undergo an introduction.Logical formLearned from55 sentences. Viruses can be programs.Logical formLearned from55 sentences. Exposure can be to a virus.Logical formLearned from55 sentences. A (stomach virus) can be nasty.Logical formLearned from55 sentences. A virus may undergo progress.Logical formLearned from55 sentences. A virus can be benign.Logical formLearned from55 sentences. A virus may undergo an analysis.Logical formLearned from55 sentences.