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https://olimex.wordpress.com/2016/06/17/friday-free-board-quiz-the-prize-is-ice40hx1k-evb-question-how-preciese-is-kicad-and-what-is-the-smallest-unit-in-pcbnew/
Friday Free Board Quiz - the prize is ICE40HX1K-EVB Question: How preciese is KiCAD and what is the smallest unit in pcbnew?