With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Twilight Saga films feature Kristen Stewart.
text_B: Valencia International Piano Competition Prize Iturbi XVI took take place in Valencia from September 15 -- 27 , 2008 .. Valencia International Piano Competition Prize Iturbi. Valencia International Piano Competition Prize Iturbi. Valencia. Valencia, Spain. It was won by Zhengyu Chen , who became the first Chinese pianist to attain the 1st prize .
not_related.