With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: To Kill a Mockingbird was written by an American novelist.
text_B: The 1990 Canadian Open was a tennis tournament played on outdoor hard courts .. tennis. tennis. outdoor hard courts. Hardcourt. It was the 101st edition of the Canada Masters and was part of the Championship Series , Single-Week of the 1990 ATP Tour and of Tier I of the 1990 WTA Tour .. Canada Masters. Canada Masters. 1990 ATP Tour. 1990 ATP Tour. Tier I. WTA Tier I tournaments. 1990 WTA Tour. 1990 WTA Tour. Canada. Canada. The men 's event took place at the du Maurier Stadium in Montreal in Canada from July 23 through July 30 , 1990 , and the women 's event at the National Tennis Centre in Toronto in Canada from July 30 through August 6 , 1990 .. du Maurier Stadium. Uniprix Stadium. Montreal. Montreal. Canada. Canada. National Tennis Centre. National Tennis Centre ( Canada ). Toronto. Toronto
not_related.