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Tsukuda's Square (hard, letters)
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A remake of the hardest of three versions, with letters A-P.

The three first version of the Tsukuda Square come in version easy, medium and hard. The hard version depicts 16 numbers. This is a remake depicting 16 letters instead. It came in at least two versions with different colours.

For the images applies:
Courtesy, The Lilly Library, Indiana University, Bloomington, Indiana.



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