ms. kirshbalm? >> thank you for the thoughtful presentation and for the follow-up on a request. as i look at these targets and the metrix, not this page but earlier in the presentation, i just have a kind of question about balancing -- i guess balancing what's achievable with kind of what the right ambition is and similar to vision zero, he talked about hitting that goal. i have a kind of big picture question about shouldn't the target for delay be zero, right? and even -- i want to be, again, cogny izant of all the realitis that you helped review in helpful detail. but there is something important of setting that as the goal that we want to have zero delay and i wanted to understand 10%, again, seems probably harder than it seems. but how does that 10% put us on a trajectory to hit zero delay eventually and have you map out what that trajectory looks like, given all the challenges that you discuss? i think there is something important about saying that our goal is eventually no delay and some of these things like that there would be four major delays each month, understanding t