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Jigsaw pieces with binary coded tabs which result in values that match up with the numbers of a 4th order diabolic magic square (of sum 30). This design could be made available in almost any size or colour scheme. Currently displaying a 4" repeat in a hyper-intelligent shade of the colour blue (ie lavender). Other colours, stylings, sizes and orientations are available on request and you can even ask for a combination of several designs together.