this the there's two part the basic intuitions what is it faster circuit set algorithms uncover a weakness in and what circuits can do so in particular it says it high-level that small circuits can't offer you skate the all zeros function they can't hide it from you so I suppose this where a black box okay and you can't actually appear inside the circuit and look at what's going on the only thing you can do is take inputs stick them in and get outputs that's why that's the only thing you could do and now you want to solve this a problem you