With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bob Marley started with people.
text_B: Vulcan 's Forge is an adventure novel by Jack Du Brul .. Jack Du Brul. Jack Du Brul. adventure novel. adventure novel. This is the 1st book featuring the author 's primary protagonist , Philip Mercer .. Philip Mercer. Philip Mercer
not_related.