Number in sequence, 3,2,1,4,5,6,7,9,10, 1,2,3,4,5,6,7,8,9,10, 11___13___15___17,18___20, 12,14,16,19, 14,13,16,19, what next to 30___?, 31, 33, 34, 35, what number is missing in 30,31,32,___,34,35, 36, 38, 33, 39

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