10 - 13, 12, 11, __, 8 - 11, 10, 9, __, 9 - 12, 11, 10, __, 17 - 20,19,18,__, 12 - 15, 14, 13, __, 15 - 18,17,16,__, 11 - 14, 13, 12, __, 13 - 16,15,14__,

Counting Backwards from 20

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