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BrickLink - Part 87580 : LEGO Plate, Modified 2 x 2 with Groove and 1 Stud in Center (Jumper) [Plate, Modified] - BrickLink Reference Catalog
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BrickLink - Part 87580 : LEGO Plate, Modified 2 x 2 with Groove and 1 Stud in Center (Jumper) [Plate, Modified] - BrickLink Reference Catalog
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BrickLink - Part 33909 : LEGO Tile, Modified 2 x 2 with Studs on Edge [Tile, Modified] - BrickLink Reference Catalog
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