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Each new number describes the previous number. (Answer in bold)
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223455423122343
312211 13112221
1113213211
331131211131221
Next in sequence is 13112221.This series describes each number that came before it:1 [One]11 [One One]21 [Two One(s)]1211 [One Two and One One(s)]111221 [One One, One Two, and Two One(s)]312211 [Three One(s), Two Two(s), and One One]The next number in the series is:13112221 [One Three, One One, Two Two(s), Two One(s)]