With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sue Sylvester appeared in Glee's first and third seasons.
text_B: The team technical routine competition at 2013 World Aquatics Championships was held on July 20 -- 22 with the preliminary round on July 20 and the final on July 22 .. 2013 World Aquatics Championships. Synchronised swimming at the 2013 World Aquatics Championships
not_related.