1, 2, 3, , 1, 2, 3, , 3, 2, 1, Count and choose, 2, 1, 3, Count and choose, 1, 2, 3, Count and choose, 3, 1, 2, count and choose, 4, 2, 1, 3, what's the number , 3, 1, 2, 4.

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