input length when I solve that problem optimally I actually get only N squared amount of computation this is possible it's actually possible we don't believe it's true but it's still a possibility we cannot rule it out and this is saying in complexity terms that X in ppalli is an open question so exponential time being in poly size there is the open question okay so just to give you just a even more crazy way in which we still don't know how like the power circuit families talk about exponential time versus shallowness some of you