With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tom Hardy did not portray "Mad" Max Rockatansky.
text_B: The 28 cm SK L / 50 was a German naval gun that was used in World War I and World War II.SK - Schnelladekanone -LRB- quick loading cannon -RRB- ; L - Lange in Kaliber -LRB- length in caliber -RRB- Originally a naval gun , it was adapted for land service after World War I.. World War I. World War I. World War II. World War II. German. Military of Germany. naval gun. naval gun. length in caliber. Caliber#Caliber as measurement of length
not_related.