With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Back to the Future II is the prequel to a film by Robert Zemeckis.
text_B: Preachers of the Night is the fifth studio album by German power metal band Powerwolf , released in 2013 .. Powerwolf. Powerwolf. German. Germany. power metal. power metal. Much like Blood of the Saints , Preachers of the Night includes in its deluxe version a bonus orchestral CD , titled The Sacrilege Symphony II .. Blood of the Saints. Blood of the Saints
not_related.