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If you count 99 as a double appearance, there are 20.
9, 19, 29, 39, 49 , 59, 69, 79, 89
90, 91, 92, 93, 94, 95, 96, 97, 98, 99
9, 19, 29, 39, 49 , 59, 69, 79, 89
90, 91, 92, 93, 94, 95, 96, 97, 98, 99
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answered 3 months ago
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