From the example before then above the numbering, I would recommend always when you number your nodes to do two ways either, horizontally or vertically. What I mean by that, is if you have these six nodes that you want to place the numbers for. You start by number them as following. Where you have number 1, number 2, 3, 4, 5 and 6. So this is a way to do it. Another way to number it, is vertically instead of horizontally so if we do have also the same six nodes here. My recommendation, which is little bit my favorite to be honest here is to go like that. Where this is active, this is node 1, 2, 3, 4, 5, and 6. So as you can tell you can be consistent from a horizontal point of view or a vertical point of view. And, as I explained in the previous example but I can cover this again in the following examples.