1 – 2 – 3 – ?, 5, 6, 4, 2 – 4 – 6 – ?, 7, 8, 9, 5 – 4 – 3 – ?, 1, 2, 4, 10 – 9 – 8 – ?, 7, 6, 8, 3 – 6 – 9 – ?, 10, 12, 11, 5-10-15-?, 16, 25, 20.

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