Addition of first and last elements to mesh line node

Hi. I am making a rectangle/square building using geometry nodes. And I would like to make first and last elements different than the other array elements (I have used mesh line node to achieve the array effect, both horizontally, as well as vertically). I know there are other ways to do it by using grid in place of mesh line, or just mesh line and subtract count by 2 , and add 1 element to the initial position and 1 to the last position normally. But I think this feature might simplify things up . Other such things can also be added to the node which I am unable to think of for now, but manipulating first and last elements will be a handy feature I think for a few tasks at least .