0 + 1 = ?, 1, 0, 1 + 0 = ?, 0, 1, 1 + 1 = ?, 2, 1, 2 + 1 = ?, 2, 3, 0 + 2 = ?, 1, 2, 2 + 0 = ?, 2, 0, 3 + 0 = ?, 0, 3, 0 + 3 = ?, 3, 0, 1 + 2 = ?, 3, 2

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