With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Stranger Things has at least two seasons.
text_B: Operation Head Start was an experimental program by the United States Air Force during the Cold War where Strategic Air Command bombers were launched from Loring Air Force Base and loitered off of the coast of western Greenland and eastern Canada .. United States Air Force. United States Air Force. Cold War. Cold War. Strategic Air Command. Strategic Air Command. Loring Air Force Base. Loring Air Force Base. Greenland. Greenland. Canada. Canada. It was operational from mid-September to mid-December 1958 .. It would eventually lead to Operation Chrome Dome , as it was part of a series of programs which showed that a continuous airborne alert could be achieved .. Operation Chrome Dome. Operation Chrome Dome
not_related.