2 × 1 = ?, 1, 4, 3, 2, 2 × 2 = ?, 4, 8, 6, 2, 2 × 3 = ?, 5, 4, 6, 8, 2 × 4 = ?, 4, 8, 6, 10, 2 × 5 = ?, 12, 10, 8, 6, 2 × 6 = ?, 12, 14, 10, 8, 2 × 7 = ?, 12, 16, 14, 10, 2 × 8 = ?, 12, 14, 18, 16, 2 × 9 = ?, 20, 18, 14, 16, 2 × 10 = ?, 22, 18, 16, 20.

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