a lot of complexity there but it's also complexity that has been pretty well modeled in aerospace at least in terms of the structure of something that you can learn so yeah yeah uh-huh we don't I mean you can't you can't ensure anything because well it yeah I guess it's a complicated question I does not exactly sometimes people ask like how do you guarantee that it's going to be obstacle free for example and and the answer to that is we can't because of perception and so nothing is ever guaranteed but we we do our best so in terms of like if