A (flu virus) may pertain-to a language.Logical formLearned from25 sentences. An epidemic can be constituted-of-or-filled-with avian flu.Logical formLearned from25 sentences. A flu can be severe.Logical formLearned from25 sentences. (Bird flu) may begin.Logical formLearned from25 sentences. (Bird flu) can be in accordance.Logical formLearned from25 sentences. A (bird flu) may sweep a continent.Logical formLearned from25 sentences. A severity may pertain-to a flu.Logical formLearned from25 sentences. A (bird flu death toll) may pertain-to a country.Logical formLearned from25 sentences. Outbreaks may pertain-to a (bird flu).Logical formLearned from25 sentences. A sign can be constituted-of-or-filled-with (bird flu).Logical formLearned from25 sentences. A flu may cause some deaths.Logical formLearned from24 sentences. A country may detect some (bird flu patients).Logical formLearned from24 sentences. Concerns can be over flu.Logical formLearned from24 sentences. A flu may undergo a complication.Logical formLearned from24 sentences. Some bouts can be constituted-of-or-filled-with flu.Logical formLearned from24 sentences.