With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: David Angell has always been single.
text_B: David Lawrence Angell -LRB- April 10 , 1946September 11 , 2001 -RRB- was an American producer of sitcoms .. producer. television producer. Angell won multiple Emmy Awards as the creator and executive producer , along with Peter Casey and David Lee , of the comedy series Frasier .. Frasier. Frasier. producer. television producer. Peter Casey. Peter Casey ( screenwriter ). David Lee. David Lee ( screenwriter ). Angell and his wife Lynn both died heading home from their vacation in Cape Cod aboard American Airlines Flight 11 .. American Airlines Flight 11. American Airlines Flight 11. This was the first plane to hit the World Trade Center during the September 11 attacks .. World Trade Center. World Trade Center ( 1973-2001 ). September 11 attacks. September 11 attacks
related.