(Computer viruses) can be dangerous.Logical formLearned from13 sentences. A virus may be penetrated.Logical formLearned from13 sentences. A virus may fizzle_out.Logical formLearned from13 sentences. Some strain can be constituted-of-or-filled-with virus.Logical formLearned from13 sentences. Scientists may discover a virus.Logical formLearned from13 sentences. An outbreak of a virus may kill some persons.Logical formLearned from13 sentences. Viruses can be prevalent.Logical formLearned from13 sentences. A virus may be uncovered in a country.Logical formLearned from13 sentences. A focus may shift to a (bird flu virus).Logical formLearned from13 sentences. Strains can be constituted-of-or-filled-with (flu virus).Logical formLearned from13 sentences. A brunt may pertain-to a virus.Logical formLearned from13 sentences. A virus may keep a male.Logical formLearned from13 sentences. A cold virus can be disabled.Logical formLearned from13 sentences. Sources may pertain-to a virus.Logical formLearned from13 sentences. A virus may be carried by birds.Logical formLearned from13 sentences.