what was put in front of aus is what wecan we do teat get to that common height and how do modify the emu. we started a 6 munlt process in conjunction of high speed rail [inaudible] send his apology, he is in sacramento, but i cht to assure you we have been [inaudible] we interviewed car buildsers and went through a process to understand what they have. we did a technical analysis to make sure there were not critical flaws and at the back end we went through what it was that would be constraints or issues on the operational side because this will be a long term effect over a 30 plus year timeframe for each of the vehiclesism the car builders that participated, there were 7 of them, there were different options proposed as part of that process. one of them was to go ahead and add additional doors a that upper and lower level and the other one was basically use something called [inaudible] which would not ree result in the loss of seats but limit the number of doors available to for passener ands to come off and go on the vehicles >> what is a trap? >> a trap is-one more picture. this i