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LEGO TECHNIC 60-Piece GEAR, Wheel, Axle and Stopper Pack Set bushing bush differential turntable motor part EV3 NXT : Everything Else - Amazon.com
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The LEGO MINDSTORMS EV3 Discovery Book: A Beginner's Guide to Building and Programming Robots: Valk, Laurens: 8601419214860: Amazon.com: Books
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