slice really easy but then you want to attend to this kind of blocky thing right here from the window attention right like this thing and this is hard to get out because you'd have to kind of index each row individually and that's very slow so what they do there is this matrix roll operation where you can sort of roll the axis around so what you'll do is you'll take this thing right here and you put it to the left right here and you'll take for example this thing right here and you'll put it to the right or no like it's it's up and down but in