With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Carole King is an American singer.
text_B: The 1999 Australian Open -- Mixed Doubles was the mixed doubles event of the eighty-seventh edition of the Australian Open , the first Grand Slam of the year .. mixed doubles. Mixed doubles ( tennis ). Grand Slam. Grand Slam ( tennis ). Venus Williams and Justin Gimelstob were the defending champions but did not compete that year .. Venus Williams. Venus Williams. Justin Gimelstob. Justin Gimelstob. Mariaan de Swardt and David Adams won in the final 6 -- 4 , 4 -- 6 , 7 -- 6 -LRB- 7 -- 5 -RRB- , against Serena Williams and Max Mirnyi .. Mariaan de Swardt. Mariaan de Swardt. David Adams. David Adams ( tennis ). Serena Williams. Serena Williams. Max Mirnyi. Max Mirnyi. One of the surprises of this tournament was that over half of the seeds fell in the first round , and none of the seeds made it past the second round .
not_related.