I have a set of ornaments of the twelve days of Christmas. Last year I sorted them into order so that I could easily make sure that they were in ascending order

I have a set of ornaments of the twelve days of Christmas. Last year I sorted them into order so that I could easily make sure that they were in ascending order on the tree. I'm going to do the same thing in two days time when we put our tree up again. I'll admit that I did it by eye, putting 1 and 12 at opposite ends of a table and then slotting the others into what seemed like the right places.