9 - 1 + 5 + 3, 3 - 2 + 2 - 1, 8 - 5 + 2 + 1, 7 - 9 - 4 + 2, 5 - 9 - 2 - 2, 3 - 1 + 1 + 1, 2 - 2 + 1 -1, 1 - 3 - 1 - 1,

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