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Amazon.com: LEGO TECHNIC 100 pcs BLACK AXLE SIZE 6 STUDS STUD LENGTH Cross Rod Mindstorms robot motor short medium part piece 3706 NXT ev3 robotics : Toys & Games
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LEGO part 42003 - Dark Azure Technic, Axle and Pin Connector Perpendicular 3L with 2 Pin Holes at BrickScout
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