1 + 1 = 2, 1, 2, 3, 1 + 2 = 3, 3, 5, 2, 2 + 2 = 4, 4, 5, 3, 2 + 3 = 5, 3, 2, 5, 3 + 1 = 4, 5, 3, 4, 4 + 1 = 5, 5, 4, 2.

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