Zg is the set of integers modulo g, denoted as Zg = {0, 1, 2, ..., g-1}. In other words, Zg is the set of remainders when dividing integers by g.
For example, Z5 = {0, 1, 2, 3, 4} and Z7 = {0, 1, 2, 3, 4, 5, 6}.
Now, let's consider U(15), which is the set of
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