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>> something to look at, for sure. i understand it's the early stages, and it's just one of the many things that have come to light. allen, you're looking for what you call a trigger event. >> that's correct. >> where might this fit as a possibility? although, again, you're not saying it is the possibility or is the main reason. why could it fit in the possibility, what else have you seen that may fit into that pattern? >> first of all, we have about 20 or 30 possible trigger possibilities. it's a matter of evaluating them or reducing the possibilities one at a time. we do that by collecting i...

Exactly why the collapse actually happened. but usually if you see this type of major failures, contributions come from multiple factors. there are plenty of buildings with variation, there's plenty of buildings which doesn't quite meet the so-called current code or how it's been engineered. but they don't collapse, you know? so it has to have a combination effect like that to make this happen. it's definitely to be considered. >> it's something to look at for sure, i understand it's still early stages. allen, you're looking for what you call to be a trigger event. >> that's correct. >> where ...