With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: There were five times that Maria Sharapova held the title of the world No. 1.
text_B: The 2011 -- 12 Tom Tomsk season is the 7th straight season that the club will play in the Russian Premier League , the highest tier of football in Russia .. Tom Tomsk. FC Tom Tomsk. Russian Premier League. Russian Premier League. Russia. Russia
not_related.