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Group the four colours to solve. Alternative names: "Doublering" or "Zweiring"
Maybe the most often produced version of this puzzle.
Size: 135 x 90 mm
Weight: 40 grams
For image 5:
Courtesy, The Lilly Library, Indiana University, Bloomington, Indiana
Thank you to the following people for their assistance in helping collect the information on this page: Sandy.
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