What are the optimal setups for planetary interaction?

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I recently moved in null sec and I was wondering about the optimal setup for an excavation colony.
Currently, I have all the PI skills at IV and I want to setup a colony that produces P2 items.
With these prerequisites ( and, if you want, with all skills at V ): What is the optimal setup for planetary interaction?
Bonus: Any image will be greatly welcome and surely help everybody.
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