With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Oscar Robertson was only nicknamed Peter.
text_B: Belmont Avenue Bridge in Philadelphia is a historic stone arch bridge located in Fairmount Park , Philadelphia , Pennsylvania .. stone arch. Arch bridge. Fairmount Park. Fairmount Park. It was built in 1896 , and is a single-span bridge .. The arch measures 29 ft.. It was added to the National Register of Historic Places in 1988 .. National Register of Historic Places. National Register of Historic Places
not_related.