With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Michael Phelps was voted to be the flag bearer of the universe.
text_B: TCDD DE20000 were the first diesel-electric locomotive built for operations on Turkish State Railways .. Turkish State Railways. Turkish State Railways. diesel-electric locomotive. diesel-electric locomotive. Five General Electric U18C units with Cooper Bessemer engines were built in 1957-58 .. U18C. U18C. Cooper Bessemer. Cooper Bessemer. General Electric. General Electric. All the locomotives are now retired from service .
not_related.