0, 3, 6, 9, ______ - 12, 15, 18, _____, 24 - 21, 9, 6, _____, 0 - 3, 24, 21, _____, 15 - 18, _____,3 ,6, 9 - 0, _____, 6, 3, 0 - 9, 9, _____, 18, 21 - 15, 18, 21, _____ - 24, 9, _____, 3, 0 - 6,

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