This problem deserves to be is some of the groups :)
Remove the polynomials that have positive real elements of their roots.
Remove NaN ?
Back to basics 11 - Max Integer
Split a string into chunks of specified length
Find and replaces spaces from a input string with *
Sorting integers by their digits (Level 4)
Sorting integers by their digits (Level 2)
The sliding puzzle: 3D
Regular polygon bounded by and bounding a circle
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