Next in the Series

Thanks to Dave Minasian for the following contribution:

1
11
21
1211
111221

Find the next member of the series.

Answer

Each succeeding line describes the previous one, counting its digits. For instance, line 2 says that line 1 has 1 '1'; line three says line 2 has 2 '1'; line four says line three has 1 '2' and 1 '1'; line five has line four has 1 '1, 1 '2', and 2 '1'.

So line six would be 312211.

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