4 - 2 + 2  , 2 - 1 + 1 , 6 - 3 + 3  , 14 - 7 + 7 , 8 - 4 + 4 , 10 - 5 + 5 , 16 - 8 + 8 , 12 - 6 + 6 , 18 - 9 + 9 , 20 - 10 + 10,

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