With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: YouTube contains books.
text_B: Ryan Hopper -LRB- born 13 November 1993 -RRB- is an English footballer who played as a midfielder for Accrington Stanley in Football League Two .. Accrington Stanley. Accrington Stanley F.C.. footballer. Association football. midfielder. midfielder ( association football ). Football League Two. Football League Two
not_related.