Now, let's find the edges of G. Two vertices are adjacent if their difference is nonzero and divisible by 3. So, the edges are:
(0, 3), (0, 6), (1, 4), (1, 7), (2, 5), (2, 8), (3, 6), (4, 7), (5, 8).
Now, let's determine if G has an Eulerian circuit. A graph
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