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All diagonal, horizontal and vertical rows add up to 15.
All six sides have the same number pattern.
This puzzls was shown in the book "Puzzles Old and New How to Make and Solve Them" which was published in 1986. This gives an upper bound for this puzzles publication.
Edge length: 57 mm
Weight: 114 grams
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Thank you to the following people for their assistance in helping collect the information on this page: Sandy.
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