20 - 10+10, 12 - 10+2, 25 - 20+5, 16 - 8+8, 15 - 5 + 5 + 5, 21 - 7 + 3 + 10 + 1, 18 - 9 + 9, 30 - 10+10+10, 26 - 20+6, 10 - 6 + 4, 22 - 10 + 5 + 5 + 2, 13 - 5+5+3, 5 - 10 - 5, 17 - 10 + 7, 8 - 10 - 2 , 6 - 3+3, 14 - 20 - 6, 7 - 5+2, 11 - 15 - 4, 9 - 5 + 2 + 2,

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