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I'll start from the beginning.
1 - You have ONE 1, so the next number is:
11 - You have TWO 1's so the next number is...
21 - you have ONE 2, and ONE 1..
1211 one 1, one 2 two 1
111221
You have THREE 1's, TWO 2's and ONE 1.
312211
Does that help?
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“It is better to be rich and healthy than poor and sick” - Dave Barry
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