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LEGO® Technic review: 42099 4x4 X-Treme Off-Roader | New Elementary: LEGO® parts, sets and techniques
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LEGO Technic 42099 4X4 X-treme Off-Roader stage 2 upgrade - even more power with only 4 extra gears! - RacingBrick
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5 minute upgrade - turn the LEGO Technic 42099 4X4 X-treme Off-Roader into a capable crawler! - YouTube
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