With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Czech Republic's largest city is Prague.
text_B: The 1997 Indonesia Open in badminton was held in Surakarta , from July 16 to July 20 , 1997 .. Indonesia Open. Indonesia Open ( badminton ). badminton. badminton. Surakarta. Surakarta. It was a five-star tournament and the prize money was US$ 200,000 .
not_related.