5 - 1, 4, 6 - 2, 4?, 7 - 3, 4!, 8 - 1, 7, 9 - 2, 7?, 10 - 3, 7!, 12 - 2, 10, 14 - 4, 10?, 15 - 5, 10!, 20 - 10, 10!!

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