With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Margaret of Valois has written memoirs.
text_B: This was the first edition of the tournament .. Misaki Doi won the title , defeating in the final Anna-Lena Friedsam with the score 6 -- 4 , 6 -- 2 .. Misaki Doi. Misaki Doi. Anna-Lena Friedsam. Anna-Lena Friedsam
not_related.