With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Elisabeth Sladen starred in roles for different media platforms.
text_B: The 2012 -- 13 Melbourne Heart FC season was the clubs third since its establishment in 2009 .. Melbourne Heart. Melbourne Heart FC. Melbourne Heart FC. Melbourne Heart FC. The club participated in the A-League for the third time .. A-League. A-League
not_related.