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Old Elementary: Eero Okkonen's ball turret and deltoid | New Elementary: LEGO® parts, sets and techniques
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Squaring the Circle: Building Round Shapes Using LEGO - BrickNerd - All things LEGO and the LEGO fan community
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Old Elementary: Eero Okkonen's ball turret and deltoid | New Elementary: LEGO® parts, sets and techniques
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