(Flu cases) may be registered in some towns.Logical formLearned from13 sentences. A (bird flu outbreak) may be reported.Logical formLearned from13 sentences. A (bird flu virus) may mutate into a strain.Logical formLearned from13 sentences. Some cases can be constituted-of-or-filled-with (bird flu worldwide).Logical formLearned from13 sentences. (Bird flu cases) may pertain-to a country.Logical formLearned from13 sentences. A country may report a case of (bird flu).Logical formLearned from13 sentences. A (bird flu virus) may be found in poultry.Logical formLearned from13 sentences. A (bird flu virus) may sweep a continent.Logical formLearned from13 sentences. A (bird flu) may pertain-to a continent.Logical formLearned from13 sentences. A woman may have (bird flu).Logical formLearned from13 sentences. (Bird flu) may kill millions of chickens.Logical formLearned from13 sentences. Some chickens may die from a (bird flu).Logical formLearned from13 sentences. A person may recover from a flu.Logical formLearned from13 sentences. Some (bird flu outbreak) may kill some persons.Logical formLearned from13 sentences. A (flu season) can be in a northern hemisphere.Logical formLearned from13 sentences.