2 - 1 + 1=, 3 - 1 + 2=, 4 - 1 + 3=, 5 - 1 + 4=, 6 - 1 + 5=, 7 - 1 + 6=, 8 - 1 + 7=, 9 - 1 + 8=, 10 - 1 + 9=,

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