With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: American Airlines Flight 77 was involved in the September 11 attacks.
text_B: Yortanlı Dam is a dam in Turkey .. Turkey. Turkey. The development was backed by the Turkish State Hydraulic Works .. Turkish State Hydraulic Works. State Hydraulic Works ( Turkey ). In 2010 , it was announced that the dam will flood an ancient city of Allianoi .. Allianoi. Allianoi
not_related.