10, 2 + 2 + 3 +3 =, 12, 1 + 1 + 5 + 5 =, 18, 3 + 3 + 6 + 6 =, 16, 2 + 2 + 6 + 6 =, 20, 1 + 1 + 9 + 9 =, 22, 4 + 7 + 4 + 7 =, 24, 9 + 3 + 9 + 3 =, 30, 11 + 4 + 11 + 4 =, 42, 15 + 6 + 15 + 6 =, 50, 21 + 4 + 21 + 4 =.

Adding 4 single digits

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