have pairs of layers completion non-linearity completion sometimes you have subsampling pooling as well but this one this one doesn't and then you have some sort of connection that can skips pairs of layers and so essentially what you can think of the function of one of those blocks as basically computing the identity function and those those those layers compute the deviation of the function of that layer from the identity so that sounds kind of a waste to just have a layer that computes the identity function and it is in fact many of the