What equations would you need to add to the graphs below in order to present the associated preorders?

![diagram](https://docs.google.com/drawings/d/e/2PACX-1vTEMwc6WWSfV49rrR281jBs3XDubpHvyIbEoPlZsN9hELBqKAp6CaX7zdMsdK-a27F9kUZ-En7NKnYl/pub?w=992&h=210)

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