With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: RB Leipzig plays a popular German sport.
text_B: The 2011 Brisbane International was a joint ATP and WTA tennis tournament , played on outdoor hard courts .. ATP. Association of Tennis Professionals. WTA. Women's Tennis Association. tennis. tennis. outdoor hard courts. Tennis court#Hard courts. It was the 3rd edition of the tournament and took place at the Queensland Tennis Centre in Tennyson , Brisbane .. Queensland Tennis Centre. Queensland Tennis Centre
not_related.