True, 1 - 1 = 0, 20 - 13 = 7, 2 - 2 = 0, 20 - 7 = 13, 11 - 4 = 7, False, 17 - 12 = 15, 5 - 5 = 11, 6 - 6 = 4, 15 - 11 = 12, 16 - 4 = 9

Math subtraction within 20

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