4 - 0 + 4 =, 5 - 1 + 4 =, 6 - 2 + 4 =, 7 - 3 + 4 =, 8 - 4 + 4 =, 9 - 5 + 4 =, 10 - 6 + 4 =, 11 - 7 + 4 =, 12 - 8 + 4 =, 13 - 9 + 4 =, 14 - 10 + 4 =, 15 - 11 + 4 =, 16 - 12 + 4 =,

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