With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Chicago featured David Hasselhoff.
text_B: This is a list of current and previous Royal Australian Air Force airstrips , aerodromes and bases .. Royal Australian Air Force. Royal Australian Air Force. The air force also owns and maintains `` bare bases '' in remote areas of Australia .. These bases have runways and buildings , but only a caretaker staff .. They are generally only used for exercises as there are no units permanently based there .
not_related.