To keep track of this, how do you actually make a car such that the next time we do it, we have a clear process flow, and we know how to get there. along the way, we met a lot of challenges. it's been, uh, well, we talked about one on the solar panel, we've developed motors that are directly in the wheels. we haven't seen those on production vehicles yet, so a lot of testing and effort went into getting those reliable and working. so, overall, i think the fair question is when we first started the company, when we were five inexperienced guys, we hugely underestimated the challenge of getting ...