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Hey, you guys remember that riddle thread a while back? Like months ago. Lets do it again, it was much fun!

Rules:
1)1 riddle at a time.
2)continue guessing untill someone does or everyone most give up
3)NO GOOGLING!

Ill start us off:

What row of numbers comes next?
1
11
21
1211
111221
312211
13112221
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