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Replying to @josecastillo

this would only be for the “Abridged Edition,” the low cost, low part count, hand-assemblable version of the book. Not counting optional stuff (JST ports, SWD header) this gadget has 28 parts: 9 buttons, 1 switch, 8 resistors, 3 capacitors, 1 MOSFET and a handful of others:

(original)