8, 5 + 3, 12, 7 + 5, 18, 9 + 9, 20, 13 + 7, 15, 10 + 5, 5, 1 + 4, 10, 4 + 6, 7, 4 + 3, 9, 8 + 1, 14, 7 + 7.

Adding within 20 Part 2

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