A (bird flu virus) may mutate into a strain.Logical formLearned from13 sentences. A strain may mutate into a disease.Logical formLearned from13 sentences. A (bird flu virus) may mutate into a form of a virus.Logical formLearned from12 sentences. Ants may be mutated by (bomb tests).Logical formLearned from12 sentences. A crusade may mutate into a quest.Logical formLearned from11 sentences. A h5n1 may mutate into a level.Logical formLearned from10 sentences. Laws may mutate refuge.Logical formLearned from10 sentences. (Slit crescent) may be mutated.Logical formLearned from10 sentences. A virus may mutate in a level.Logical formLearned from9 sentences. A virus may mutate into a new type.Logical formLearned from9 sentences. A body may be mutated.Logical formLearned from9 sentences. A flu may mutate into a form.Logical formLearned from9 sentences. A virus may be mutated into a strain.Logical formLearned from9 sentences. A virus may be mutated from pigs.Logical formLearned from9 sentences. A virus may mutate with (flu strains).Logical formLearned from9 sentences.