15 − 4 =, 4, 11, 18 − 6 =, 12, 18, 13 − 5 =, 8, 5, 17 − 3 =, 16, 14, 16 − 8 =, 8, 4, 19 − 7 =, 7, 12, 14 − 6 =, 8, 3, 20 − 9 =, 11, 8, 12 − 4 =, 8, 4, 8 − 9 =, 9, 8

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