On September 11th, 2001 the world trade centers were hit by two 747s and collapsed. building 1 was hit by a 747, and so was building number 2 (the two buildings everyone saw on TV). However, building number 7 of the world trade center, which wasn't directly adjacent to buildings one and two, still collapsed even though there was no structural damage caused by the collapse of builds 1 or 2 or another plane. what happened to building number 7?
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