15 + 5, 5, 20, 10, 8, 12 + 12, 24, 21, 9 + 9 =, 18, 16, 13 + 4 =, 15, 17, 20 + 5, 20, 25, 18 + 4 =, 22, 20, 11 + 7 =, 18, 19, 19 + 6 =, 24, 25.

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