Remove the polynomials that have positive real elements of their roots.
Calculate the Levenshtein distance between two strings
Put two time series onto the same time basis
Sum the real and imaginary parts of a complex number
Easy Sequences 20: Counting Prime-sided Rectangles
Easy Sequences 45: Second Derivative of Inverse Polynomial Function
Easy Sequences 3: Prime 44-number Squares
Easy Sequences 27: Product of Radicals of Integers
Easy Sequences 46: Semi-prime Leap Year Pairs
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