bottom floor and we looked at whether or not the supply sands in the corridor failed, the exhaust fans failtd, both failed, and we looked at whether the dampers failed and whether, 25 percent failed and whether they all worked or whether they all failed. okay? it is a pretty big matrix to run through and we ran through it using a term called contam which is a network model and it solves a series of equations that say that if you have the high pressure in this room and the low pressure in the hall the air will flow from this room to the hall through a series of openings that will allow you to go through a whole bunch of these simulation and look for bad okay tore and that is what we did, and we took those bad actors and ran them through a comprehensive model. it allows us to run those quickly and it heats our offices, the result of both of those sets of that if all of the dampers worked fine, everything is safe. despite the fans operating or not operating, and also showed that if you have 25 percent damper failure and one damper is in the room of fire origin, that is bad. that smoke is go to g