9+9, 2 × 9 =18, 8+8, 2 × 8 =16, 2, 2 × 1 =, 5+5, 2 × 5 =10, 6+6, 2 × 6 =12, 20, 2 × 10 =, 3+3, 2 × 3 =6, 2+2+2+2+2+2+2, 2 × 7 =14

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