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https://olimex.wordpress.com/2016/07/15/friday-free-board-quiz-the-prize-is-olimexino-32u4-how-many-routing-modes-are-supported-by-the-interactive-router-in-pcbnew/
Friday Free Board Quiz - the prize is OLIMEXINO-32U4 - How many routing modes are supported by the interactive router in pcbnew?