With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Cersei Lannister is in a nonfiction series.
text_B: David S. Potter -LRB- born January 16 , 1925 -RRB- was United States Assistant Secretary of the Navy -LRB- Research and Development -RRB- from 1973 to 1974 and Under Secretary of the Navy from 1974 to 1976 .. United States. United States. Under Secretary of the Navy. Under Secretary of the Navy. After he left public service , Potter was a long-time executive at General Motors .. General Motors. General Motors
not_related.