With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Amazon.com only offers tools.
text_B: The 1988 Davis Cup was the 77th edition of the most important tournament between national teams in men 's tennis .. tennis. tennis. For the first time , the Zones were divided into two groups , with promotion and relegation between the two .. The Eastern Zone was also renamed the Asia / Oceania Zone .. A total of 74 nations participated in the tournament .. In the final , West Germany defeated Sweden at the Scandinavium in Gothenburg , Sweden , on 16 -- 18 December .. West Germany. Germany Davis Cup team. Sweden. Sweden. Scandinavium. Scandinavium. Gothenburg. Gothenburg
not_related.