What is the tallest building in the city that was attacked first on September 11, 2001?
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Al-Qaeda was a participant in the September 11 attacks, which was a significant event.
Al-Qaeda was a participant in the September 11 attacks .
What is the tallest building in the city that was attacked first on September 11, 2001?</s> [unused1]Al-Qaeda                [unused2] was a participant in the September 11 attacks, which was a significant event.
What is the tallest building in the city that was attacked first on September 11, 2001?</s>Al-Qaeda was a participant in the September 11 attacks, which was a significant event.
What is the tallest building in the city that was attacked first on September 11, 2001?</s> [unused1]Al-Qaeda                [unused2] was a participant in the September 11 attacks .
What is the tallest building in the city that was attacked first on September 11, 2001?</s>Al-Qaeda was a participant in the September 11 attacks .
What is the tallest building in the city that was attacked first on September 11, 2001?</s>September 11 attacks,0,September 11 attacks,September 11 attacks,participant,[unused1]Al-Qaeda[unused2],[unused1]Al-Qaeda[unused2],significant event,September 11 attacks,[unused1]Al-Qaeda[unused2],0,[unused1]Al-Qaeda[unused2]
What is the tallest building in the city that was attacked first on September 11, 2001?</s>September 11 attacks,0,September 11 attacks,September 11 attacks,participant,Al-Qaeda,Al-Qaeda,significant event,September 11 attacks,Al-Qaeda,0,Al-Qaeda