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Key terms:
aircraft impact
airplane impacts
aviation unit
buckled
civil engineers
cleanup
collapse
collapse mechanism
columns
continued to burn
controlled demolition
core columns
deformation
eagar
empire state building
fdny
fema
fire protection
firefighters
fireproofing
fires
floor trusses
floors
impact locations
institute of standards and technology
issued orders
jet fuel
marriott
national institute of standards
nist
nist found
nist report
north tower
north tower collapsed
nypd
pancake collapse
perimeter
perimeter columns
progressive collapse
south tower
south tower collapsed
structural engineers
tower collapsed
trusses
twin towers
weaken
world financial center
world trade center
wtc
wtc site
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