What is subtraction? For example, 5 - 1 = 4, What is subtraction? For example, 2 - 1 = 1, What is subtraction? For example, 3 - 2 = 1, What is subtraction? For example, 5 - 2 = 3, What is subtraction? For example, 3 - 2 = 1, 3 - 1 =, 5, 2, 5 - 3 =, 2, 7, 8 - 4 =, 4, 10, 10 - 5 =, 1, 5, 10 - 7 =, 3, 7, 15 - 2 =, 2, 13, 14 - 5 =, 9, 20, 18 - 3 =, 15, 8, 16 - 4 =, 1, 12, 20 - 6 =, 14, 19

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