With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robert Chase worked under a fictional character Gregory House.
text_B: The 2019 CONCACAF Cup -LRB- officially the CONCACAF Cup presented by Scotiabank for sponsorship reasons -RRB- will be an international football play-off match to determine CONCACAF 's entry into the 2021 FIFA Confederations Cup .. football. association football. CONCACAF. CONCACAF. 2021 FIFA Confederations Cup. 2021 FIFA Confederations Cup. The 2017 CONCACAF Gold Cup winner will play against the 2019 CONCACAF Gold Cup winner on a date to be announced and in a venue yet to be announced .. CONCACAF. CONCACAF. 2017 CONCACAF Gold Cup. 2017 CONCACAF Gold Cup. 2019 CONCACAF Gold Cup. 2019 CONCACAF Gold Cup
not_related.