The [https://github.com/mchobby/pyboard-driver/tree/master/Pico Github of MCHobby contains useful PICO ressources] for designing schematic and board with the Pico.
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The [https://github.com/mchobby/pyboard-driver/tree/master/Pico#pico-overlay Pico overlay] help to identifies Pins on the Pico.