With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Choir is a musical ensemble also known as a chorus.
text_B: Ryback , ring name of Ryan Reeves -LRB- born 1981 -RRB- , is an American professional wrestler .. Ryback. Ryback. Ryback may also refer to  :. Ryback. Ryback. Casey Ryback , fictional Navy SEAL commando and counter-terrorist in the Under Siege films played by Steven Seagal. Ryback. Ryback. Casey Ryback. Casey Ryback. Timothy W. Ryback -LRB- 21st century -RRB- , American historian. Ryback. Ryback. Timothy W. Ryback. Timothy W. Ryback
not_related.