With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Boston Legal was written by Alan Shore.
text_B: Christopher Jon `` Chris '' Martin , -LRB- 15 May 1973 -- 25 November 2015 -RRB- was a British civil servant .. civil servant. civil servant. He was Principal Private Secretary to the Prime Minister from 2012 to 2015 .. Principal Private Secretary to the Prime Minister. Principal Private Secretary to the Prime Minister
not_related.