With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Natalie Wood was directed by Alfred Hitchcock.
text_B: The Vz .. 50 -LRB- also known as the CZ 50 -RRB- is a Czech made double-action , semi-automatic pistol .. Vz is an abbreviation of the Czechoslovakian term `` vzor '' meaning model .
not_related.