With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Benedict Cumberbatch appeared in a magazine.
text_B: Raggamuffin Vol 2 is a New Zealand and Australian compilation album released to coincide with the upcoming Raggamuffin Music Festival in 2009 .. Raggamuffin Music Festival. Raggamuffin Music Festival. It contains two tracks from each of the nine artists appearing on the Raggamuffin Festival 2009 bill -- featuring Ziggy Marley , Eddy Grant , Ali Campbell , Shaggy , Arrested Development , Inner Circle , Kora , Unity Pacific , & Three Houses Down .
not_related.