With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Martin Hingis was the doubles world No. 1.
text_B: Comedown may refer to  :. Comedown -LRB- drugs -RRB- , the aftereffects of stimulant use. Comedown -LRB- film -RRB- , a 2012 film starring Adam Deacon
not_related.