O Right there, order n. So I have order n operations at each level in the tree.

Start by identifying who your competitors are, what they do and sell, and how they operate.

You want these operations to occur in sequence and you will wire them together in the next panel.

So, you need to have at least one fault as part of the operation.

Your first thought might be to add the method to one of your own classes as an instance method, but the method may not really operate on any of your own objects.