A fire may be caused by an explosion.Logical formLearned from30 sentences. A blast may be caused by an improvised device.Logical formLearned from30 sentences. A blast may be caused by a rocket.Logical formLearned from30 sentences. Damage may be caused by an explosion.Logical formLearned from30 sentences. A virus may cause smallpox.Logical formLearned from30 sentences. A vacancy may be caused by a resignation.Logical formLearned from30 sentences. Pathogens may cause disease.Logical formLearned from30 sentences. A disease may be caused by a virus.Logical formLearned from30 sentences. Bacteria may cause tb.Logical formLearned from30 sentences. Cross contamination may be caused by handling of a pet food.Logical formLearned from30 sentences. A system may cause problems.Logical formLearned from30 sentences. An (acne drug) may cause (birth defects).Logical formLearned from30 sentences. Accutane may cause (birth defects) a risk.Logical formLearned from30 sentences. (Lung condition) may be caused by a gene-accutane.Logical formLearned from30 sentences. A concern may cause by itunes.Logical formLearned from30 sentences.