With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: British Columbia's economic mainstay is not resource extraction.
text_B: Samuel Jefferson `` Jeff '' Flake -LRB- June 25 , 1877 -- May 30 , 1971 -RRB- was an American politician in the state of Florida .. Florida. Florida. He served in the Florida State Senate in 1947 as a Democratic member for the 27th district .. Florida. Florida
not_related.