Final digit of 8^n. 1, 8, 4, 2, 6, 8, 4, 2, 6, 8, 4, 2, 6, 8, 4, 2, 6, 8, 4, 2, 6, 8, 4, 2, 6, 8, 4, 2, 6, 8, 4, 2, 6, 8
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