With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Demon Days has sold copies in 1995.
text_B: Myopericarditis is a combination of both myocarditis and pericarditis appearing in a single individual , namely inflammation of both the pericardium and the heart muscle .. myocarditis. myocarditis. pericarditis. pericarditis. It can involve the presence of fluid in the heart .. Myopericarditis refers primarily to a pericarditis with lesser myocarditis , as opposed to a perimyocarditis , though the two terms are often used interchangeably .. myocarditis. myocarditis. pericarditis. pericarditis. Both will be reflected on an ECG .. Myo-pericarditis usually involves inflammation of the pericardium , or the sac covering the heart .. pericarditis. pericarditis. The ACAM2000 smallpox vaccine could cause myopericarditis in some people , according to https : /  / www.ncbi.nlm.nih.gov / pmc / articles / PMC2880337 /. Category  : Pericardial disorders. Category  : Disorders of fascia. Category  : Inflammations
not_related.