With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Agatha Christie was a mystery writer.
text_B: The Fishbein Trophy is awarded to the player who wins the greatest number of masterpoints at the summer American Contract Bridge League -LRB- ACBL -RRB- North American Bridge Championship -LRB- NABC -RRB- .. masterpoints. masterpoints. American Contract Bridge League. American Contract Bridge League. North American Bridge Championship. North American Bridge Championships
not_related.