With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South Korea's main language was invented in 1445.
text_B: Oklahoma 's sixth congressional district is a former Congressional district in western Oklahoma .. Oklahoma. Oklahoma. Oklahoma gained 3 seats from the 1910 census , but elected the extra seats at-large in 1912 .. Oklahoma. Oklahoma. 1910 census. 1910 United States Census. at-large. at-large. The sixth district was thus created and used for the 1914 House election .. 1914 House election. U.S. House election, 1914. Oklahoma has gradually lost seats since the 1910 census , and lost its 6th seat in the 2000 census .. Oklahoma. Oklahoma. 1910 census. 1910 United States Census. 2000 census. 2000 United States Census. This resulted in the district being disbanded in 2003 ; most of its territory is now the 3rd District .. 3rd District. Oklahoma's 3rd congressional district
not_related.