with a stack of observations not just a single observation because so for example in Atari people always concatenate something like for the four last frames right and their their point is okay if we have this stack here if we do this data augmentation you know these crops we kind of need to do them consistently right we need to crop every single image at the same point for the query and also if we do a random crop let's say a random crop down here we need to do this same random crop for all of the of the stack of images here right