1, ? - 1 = 0, 19, ? - 12 = 7, 15, 20 - ? = 5, 10, ? - 9 = 1, 7, 18 - ? = 11, 12, 15 - ? = 3, 5, ? - 1 = 4, 0, 4 - ? = 4, 8, 9 - ? = 1, 2, ? - 2 = 0.

SUBTRACTION MISSING NUMBER

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