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Figure 2
(a) Multiplication table of 1′1*. To evaluate the product of two elements, we find the row associated with the first element and the column associated with the second element, e.g. for 1′·1*, go to the second row, third column to find 1′*. (b) Cayley graph generated by 1′, 1* and 1′*. To evaluate the product of two elements, we start from the circle representing the first element and follow the arrow representing the second, e.g. for 1′·1*, we start on the red circle (1′) and take the blue path (1*) to the green circle (1′*).

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