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SCS Direct Light Up Building Bricks (2x3) - Multicolor for Each Brick - with On/Off and Dim Ability (Set of 8) - Tight Fit with All Major Brands : Amazon.co.uk: Toys & Games
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BrickLink - Part 54930c01 : LEGO Electric, Light Brick 2 x 3 x 1 1/3 with Trans-Red Top and Red LED Light [Electric, Light & Sound] - BrickLink Reference Catalog
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