only is the concept for the things that you put attention on yeah and the state are those three in agreement and the energy function is happy okay we have covered the basics now let's dive into the paper I think this is the longest introduction ever but I think it will pay off once see so they they specifically or this this author I think it's a single author identifies two different things that you can do with an energy function here of course you can do more as we saw but they identify two so here is where you