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also can be like

9 19 29 39 49 59 69 79 89 90 91 92 93 94 95 96 97 98 99

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

but guys 99 will be counted 2 times because its tens place is 9 ones is also 9

19+1=20.

What else can I help you with?