7 - 3 + 4 =, 5 - 2 + 3=, 3 - 1 + 2 =, 9 - 4 + 5 = , 17 - 8 + 9 = , 13 - 6 + 7 =, 11 - 5 + 6 =, 19 - 9 + 10 =, 15 - 7 + 8 =, 21 - 10 + 11=, 23 - 11+12=, 25 - 12+13=,

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